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<span class="Comment">//: Run a second routine concurrently using 'start-running', without any</span>
<span class="Comment">//: guarantees on how the operations in each are interleaved with each other.</span>
<span class="Delimiter">:(scenario scheduler)</span>
recipe f1 [
start-running f2:recipe
<span class="Comment"># wait for f2 to run</span>
<span class="Delimiter">{</span>
jump-unless <span class="Constant">1</span>:number<span class="Delimiter">,</span> -<span class="Constant">1</span>
<span class="Delimiter">}</span>
]
recipe f2 [
<span class="Constant">1</span>:number<span class="Special"> <- </span>copy <span class="Constant">1</span>
]
<span class="traceContains">+schedule: f1</span>
<span class="traceContains">+schedule: f2</span>
<span class="Comment">//: first, add a deadline to run(routine)</span>
<span class="Comment">//: these changes are ugly and brittle; just close your nose and get through the next few lines</span>
<span class="Delimiter">:(replace "void run_current_routine()")</span>
void run_current_routine<span class="Delimiter">(</span>long long int time_slice<span class="Delimiter">)</span>
<span class="Delimiter">:(replace "while (!Current_routine->completed())" following "void run_current_routine(long long int time_slice)")</span>
long long int ninstrs = <span class="Constant">0</span><span class="Delimiter">;</span>
while <span class="Delimiter">(</span>Current_routine<span class="Delimiter">-></span>state == RUNNING && ninstrs < time_slice<span class="Delimiter">)</span>
<span class="Delimiter">:(after "Running One Instruction")</span>
ninstrs++<span class="Delimiter">;</span>
<span class="Comment">//: now the rest of the scheduler is clean</span>
<span class="Delimiter">:(before "struct routine")</span>
enum routine_state <span class="Delimiter">{</span>
RUNNING<span class="Delimiter">,</span>
COMPLETED<span class="Delimiter">,</span>
<span class="Comment">// End routine States</span>
<span class="Delimiter">};</span>
<span class="Delimiter">:(before "End routine Fields")</span>
enum routine_state state<span class="Delimiter">;</span>
<span class="Delimiter">:(before "End routine Constructor")</span>
state = RUNNING<span class="Delimiter">;</span>
<span class="Delimiter">:(before "End Globals")</span>
vector<routine*> Routines<span class="Delimiter">;</span>
long long int Current_routine_index = <span class="Constant">0</span><span class="Delimiter">;</span>
long long int Scheduling_interval = <span class="Constant">500</span><span class="Delimiter">;</span>
<span class="Delimiter">:(before "End Setup")</span>
Scheduling_interval = <span class="Constant">500</span><span class="Delimiter">;</span>
Routines<span class="Delimiter">.</span>clear<span class="Delimiter">();</span>
<span class="Delimiter">:(replace{} "void run(recipe_ordinal r)")</span>
void run<span class="Delimiter">(</span>recipe_ordinal r<span class="Delimiter">)</span> <span class="Delimiter">{</span>
run<span class="Delimiter">(</span>new routine<span class="Delimiter">(</span>r<span class="Delimiter">));</span>
<span class="Delimiter">}</span>
<span class="Delimiter">:(code)</span>
void run<span class="Delimiter">(</span>routine* rr<span class="Delimiter">)</span> <span class="Delimiter">{</span>
Routines<span class="Delimiter">.</span>push_back<span class="Delimiter">(</span>rr<span class="Delimiter">);</span>
Current_routine_index = <span class="Constant">0</span><span class="Delimiter">,</span> Current_routine = Routines<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">);</span>
while <span class="Delimiter">(</span>!all_routines_done<span class="Delimiter">())</span> <span class="Delimiter">{</span>
skip_to_next_routine<span class="Delimiter">();</span>
assert<span class="Delimiter">(</span>Current_routine<span class="Delimiter">);</span>
assert<span class="Delimiter">(</span>Current_routine<span class="Delimiter">-></span>state == RUNNING<span class="Delimiter">);</span>
trace<span class="Delimiter">(</span><span class="Constant">"schedule"</span><span class="Delimiter">)</span> << current_routine_label<span class="Delimiter">()</span> << end<span class="Delimiter">();</span>
run_current_routine<span class="Delimiter">(</span>Scheduling_interval<span class="Delimiter">);</span>
<span class="Comment">// Scheduler State Transitions</span>
if <span class="Delimiter">(</span>Current_routine<span class="Delimiter">-></span>completed<span class="Delimiter">())</span>
Current_routine<span class="Delimiter">-></span>state = COMPLETED<span class="Delimiter">;</span>
<span class="Comment">// End Scheduler State Transitions</span>
<span class="Comment">// Scheduler Cleanup</span>
<span class="Comment">// End Scheduler Cleanup</span>
<span class="Delimiter">}</span>
<span class="Delimiter">}</span>
bool all_routines_done<span class="Delimiter">()</span> <span class="Delimiter">{</span>
for <span class="Delimiter">(</span>long long int i = <span class="Constant">0</span><span class="Delimiter">;</span> i < SIZE<span class="Delimiter">(</span>Routines<span class="Delimiter">);</span> ++i<span class="Delimiter">)</span> <span class="Delimiter">{</span>
if <span class="Delimiter">(</span>Routines<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">)-></span>state == RUNNING<span class="Delimiter">)</span> <span class="Delimiter">{</span>
<span class="Identifier">return</span> <span class="Constant">false</span><span class="Delimiter">;</span>
<span class="Delimiter">}</span>
<span class="Delimiter">}</span>
<span class="Identifier">return</span> <span class="Constant">true</span><span class="Delimiter">;</span>
<span class="Delimiter">}</span>
<span class="Comment">// skip Current_routine_index past non-RUNNING routines</span>
void skip_to_next_routine<span class="Delimiter">()</span> <span class="Delimiter">{</span>
assert<span class="Delimiter">(</span>!Routines<span class="Delimiter">.</span>empty<span class="Delimiter">());</span>
assert<span class="Delimiter">(</span>Current_routine_index < SIZE<span class="Delimiter">(</span>Routines<span class="Delimiter">));</span>
for <span class="Delimiter">(</span>long long int i = <span class="Delimiter">(</span>Current_routine_index+<span class="Constant">1</span><span class="Delimiter">)</span>%SIZE<span class="Delimiter">(</span>Routines<span class="Delimiter">);</span> i != Current_routine_index<span class="Delimiter">;</span> i = <span class="Delimiter">(</span>i+<span class="Constant">1</span><span class="Delimiter">)</span>%SIZE<span class="Delimiter">(</span>Routines<span class="Delimiter">))</span> <span class="Delimiter">{</span>
if <span class="Delimiter">(</span>Routines<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">)-></span>state == RUNNING<span class="Delimiter">)</span> <span class="Delimiter">{</span>
Current_routine_index = i<span class="Delimiter">;</span>
Current_routine = Routines<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">);</span>
<span class="Identifier">return</span><span class="Delimiter">;</span>
<span class="Delimiter">}</span>
<span class="Delimiter">}</span>
<span class="Delimiter">}</span>
string current_routine_label<span class="Delimiter">()</span> <span class="Delimiter">{</span>
ostringstream result<span class="Delimiter">;</span>
call_stack calls = Current_routine<span class="Delimiter">-></span>calls<span class="Delimiter">;</span>
for <span class="Delimiter">(</span>call_stack::iterator p = calls<span class="Delimiter">.</span>begin<span class="Delimiter">();</span> p != calls<span class="Delimiter">.</span>end<span class="Delimiter">();</span> ++p<span class="Delimiter">)</span> <span class="Delimiter">{</span>
if <span class="Delimiter">(</span>p != calls<span class="Delimiter">.</span>begin<span class="Delimiter">())</span> result << <span class="Constant">'/'</span><span class="Delimiter">;</span>
result << Recipe[p<span class="Delimiter">-></span>running_recipe]<span class="Delimiter">.</span>name<span class="Delimiter">;</span>
<span class="Delimiter">}</span>
<span class="Identifier">return</span> result<span class="Delimiter">.</span>str<span class="Delimiter">();</span>
<span class="Delimiter">}</span>
<span class="Delimiter">:(before "End Teardown")</span>
for <span class="Delimiter">(</span>long long int i = <span class="Constant">0</span><span class="Delimiter">;</span> i < SIZE<span class="Delimiter">(</span>Routines<span class="Delimiter">);</span> ++i<span class="Delimiter">)</span>
delete Routines<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">);</span>
Routines<span class="Delimiter">.</span>clear<span class="Delimiter">();</span>
<span class="Comment">//: special case for the very first routine</span>
<span class="Delimiter">:(replace{} "void run_main(int argc, char* argv[])")</span>
void run_main<span class="Delimiter">(</span>int argc<span class="Delimiter">,</span> char* argv[]<span class="Delimiter">)</span> <span class="Delimiter">{</span>
recipe_ordinal r = Recipe_ordinal[string<span class="Delimiter">(</span><span class="Constant">"main"</span><span class="Delimiter">)</span>]<span class="Delimiter">;</span>
if <span class="Delimiter">(</span>r<span class="Delimiter">)</span> <span class="Delimiter">{</span>
<span class="Comment">// pass in commandline args as ingredients to main</span>
<span class="Comment">// todo: test this</span>
routine* rr = new routine<span class="Delimiter">(</span>r<span class="Delimiter">);</span>
Current_routine = rr<span class="Delimiter">;</span>
for <span class="Delimiter">(</span>long long int i = <span class="Constant">1</span><span class="Delimiter">;</span> i < argc<span class="Delimiter">;</span> ++i<span class="Delimiter">)</span> <span class="Delimiter">{</span>
vector<double> arg<span class="Delimiter">;</span>
arg<span class="Delimiter">.</span>push_back<span class="Delimiter">(</span>new_mu_string<span class="Delimiter">(</span>argv[i]<span class="Delimiter">));</span>
Current_routine<span class="Delimiter">-></span>calls<span class="Delimiter">.</span>front<span class="Delimiter">().</span>ingredient_atoms<span class="Delimiter">.</span>push_back<span class="Delimiter">(</span>arg<span class="Delimiter">);</span>
<span class="Delimiter">}</span>
run<span class="Delimiter">(</span>rr<span class="Delimiter">);</span>
<span class="Delimiter">}</span>
<span class="Delimiter">}</span>
<span class="SalientComment">//:: To schedule new routines to run, call 'start-running'.</span>
<span class="Comment">//: 'start-running' will return a unique id for the routine that was created.</span>
<span class="Comment">//: routine id is a number, but don't do any arithmetic on it</span>
<span class="Delimiter">:(before "End routine Fields")</span>
long long int id<span class="Delimiter">;</span>
<span class="Delimiter">:(before "End Globals")</span>
long long int Next_routine_id = <span class="Constant">1</span><span class="Delimiter">;</span>
<span class="Delimiter">:(before "End Setup")</span>
Next_routine_id = <span class="Constant">1</span><span class="Delimiter">;</span>
<span class="Delimiter">:(before "End routine Constructor")</span>
id = Next_routine_id<span class="Delimiter">;</span>
Next_routine_id++<span class="Delimiter">;</span>
<span class="Comment">//: routines save the routine that spawned them</span>
<span class="Delimiter">:(before "End routine Fields")</span>
<span class="Comment">// todo: really should be routine_id, but that's less efficient.</span>
long long int parent_index<span class="Delimiter">;</span> <span class="Comment">// only < 0 if there's no parent_index</span>
<span class="Delimiter">:(before "End routine Constructor")</span>
parent_index = -<span class="Constant">1</span><span class="Delimiter">;</span>
<span class="Delimiter">:(before "End Primitive Recipe Declarations")</span>
START_RUNNING<span class="Delimiter">,</span>
<span class="Delimiter">:(before "End Primitive Recipe Numbers")</span>
Recipe_ordinal[<span class="Constant">"start-running"</span>] = START_RUNNING<span class="Delimiter">;</span>
<span class="Delimiter">:(before "End Primitive Recipe Implementations")</span>
case START_RUNNING: <span class="Delimiter">{</span>
if <span class="Delimiter">(</span>ingredients<span class="Delimiter">.</span>empty<span class="Delimiter">())</span> <span class="Delimiter">{</span>
raise << <span class="Constant">"'start-running' requires at least one ingredient: the recipe to start running</span><span class="cSpecial">\n</span><span class="Constant">"</span> << end<span class="Delimiter">();</span>
<span class="Identifier">break</span><span class="Delimiter">;</span>
<span class="Delimiter">}</span>
if <span class="Delimiter">(</span>!scalar<span class="Delimiter">(</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">)))</span> <span class="Delimiter">{</span>
raise << <span class="Constant">"first ingredient of 'start-running' should be a recipe, but got "</span> << current_instruction<span class="Delimiter">().</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">).</span>original_string << <span class="cSpecial">'\n'</span> << end<span class="Delimiter">();</span>
<span class="Identifier">break</span><span class="Delimiter">;</span>
<span class="Delimiter">}</span>
if <span class="Delimiter">(</span>!ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">).</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">))</span> <span class="Delimiter">{</span>
raise << <span class="Constant">"'start-running' received non-existent recipe: '"</span> << current_instruction<span class="Delimiter">().</span>to_string<span class="Delimiter">()</span> << <span class="Constant">"'</span><span class="cSpecial">\n</span><span class="Constant">"</span> << end<span class="Delimiter">();</span>
<span class="Identifier">break</span><span class="Delimiter">;</span>
<span class="Delimiter">}</span>
routine* new_routine = new routine<span class="Delimiter">(</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">).</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">));</span>
new_routine<span class="Delimiter">-></span>parent_index = Current_routine_index<span class="Delimiter">;</span>
<span class="Comment">// populate ingredients</span>
for <span class="Delimiter">(</span>long long int i = <span class="Constant">1</span><span class="Delimiter">;</span> i < SIZE<span class="Delimiter">(</span>current_instruction<span class="Delimiter">().</span>ingredients<span class="Delimiter">);</span> ++i<span class="Delimiter">)</span>
new_routine<span class="Delimiter">-></span>calls<span class="Delimiter">.</span>front<span class="Delimiter">().</span>ingredient_atoms<span class="Delimiter">.</span>push_back<span class="Delimiter">(</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">));</span>
Routines<span class="Delimiter">.</span>push_back<span class="Delimiter">(</span>new_routine<span class="Delimiter">);</span>
products<span class="Delimiter">.</span>resize<span class="Delimiter">(</span><span class="Constant">1</span><span class="Delimiter">);</span>
products<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">).</span>push_back<span class="Delimiter">(</span>new_routine<span class="Delimiter">-></span>id<span class="Delimiter">);</span>
<span class="Identifier">break</span><span class="Delimiter">;</span>
<span class="Delimiter">}</span>
<span class="Delimiter">:(scenario scheduler_runs_single_routine)</span>
<span class="Special">% Scheduling_interval = 1;</span>
recipe f1 [
<span class="Constant">1</span>:number<span class="Special"> <- </span>copy <span class="Constant">0</span>
<span class="Constant">2</span>:number<span class="Special"> <- </span>copy <span class="Constant">0</span>
]
<span class="traceContains">+schedule: f1</span>
<span class="traceContains">+run: 1:number <- copy 0</span>
<span class="traceContains">+schedule: f1</span>
<span class="traceContains">+run: 2:number <- copy 0</span>
<span class="Delimiter">:(scenario scheduler_interleaves_routines)</span>
<span class="Special">% Scheduling_interval = 1;</span>
recipe f1 [
start-running f2:recipe
<span class="Constant">1</span>:number<span class="Special"> <- </span>copy <span class="Constant">0</span>
<span class="Constant">2</span>:number<span class="Special"> <- </span>copy <span class="Constant">0</span>
]
recipe f2 [
<span class="Constant">3</span>:number<span class="Special"> <- </span>copy <span class="Constant">0</span>
<span class="Constant">4</span>:number<span class="Special"> <- </span>copy <span class="Constant">0</span>
]
<span class="traceContains">+schedule: f1</span>
<span class="traceContains">+run: start-running f2:recipe</span>
<span class="traceContains">+schedule: f2</span>
<span class="traceContains">+run: 3:number <- copy 0</span>
<span class="traceContains">+schedule: f1</span>
<span class="traceContains">+run: 1:number <- copy 0</span>
<span class="traceContains">+schedule: f2</span>
<span class="traceContains">+run: 4:number <- copy 0</span>
<span class="traceContains">+schedule: f1</span>
<span class="traceContains">+run: 2:number <- copy 0</span>
<span class="Delimiter">:(scenario start_running_takes_args)</span>
recipe f1 [
start-running f2:recipe<span class="Delimiter">,</span> <span class="Constant">3</span>
<span class="Comment"># wait for f2 to run</span>
<span class="Delimiter">{</span>
jump-unless <span class="Constant">1</span>:number<span class="Delimiter">,</span> -<span class="Constant">1</span>
<span class="Delimiter">}</span>
]
recipe f2 [
<span class="Constant">1</span>:number<span class="Special"> <- </span>next-ingredient
<span class="Constant">2</span>:number<span class="Special"> <- </span>add <span class="Constant">1</span>:number<span class="Delimiter">,</span> <span class="Constant">1</span>
]
<span class="traceContains">+mem: storing 4 in location 2</span>
<span class="Delimiter">:(scenario start_running_returns_routine_id)</span>
recipe f1 [
<span class="Constant">1</span>:number<span class="Special"> <- </span>start-running f2:recipe
]
recipe f2 [
<span class="Constant">12</span>:number<span class="Special"> <- </span>copy <span class="Constant">44</span>
]
<span class="traceContains">+mem: storing 2 in location 1</span>
<span class="Comment">//: this scenario will require some careful setup in escaped C++</span>
<span class="Comment">//: (straining our tangle capabilities to near-breaking point)</span>
<span class="Delimiter">:(scenario scheduler_skips_completed_routines)</span>
<span class="Special">% recipe_ordinal f1 = load("recipe f1 [\n1:number <- copy 0\n]\n").front();</span>
<span class="Special">% recipe_ordinal f2 = load("recipe f2 [\n2:number <- copy 0\n]\n").front();</span>
<span class="Special">% Routines.push_back(new routine(f1)); // f1 meant to run</span>
<span class="Special">% Routines.push_back(new routine(f2));</span>
<span class="Special">% Routines.back()->state = COMPLETED; // f2 not meant to run</span>
<span class="Comment"># must have at least one routine without escaping</span>
recipe f3 [
<span class="Constant">3</span>:number<span class="Special"> <- </span>copy <span class="Constant">0</span>
]
<span class="Comment"># by interleaving '+' lines with '-' lines, we allow f1 and f3 to run in any order</span>
<span class="traceContains">+schedule: f1</span>
<span class="traceContains">+mem: storing 0 in location 1</span>
<span class="traceAbsent">-schedule: f2</span>
<span class="traceAbsent">-mem: storing 0 in location 2</span>
<span class="traceContains">+schedule: f3</span>
<span class="traceContains">+mem: storing 0 in location 3</span>
<span class="Delimiter">:(scenario scheduler_starts_at_middle_of_routines)</span>
<span class="Special">% Routines.push_back(new routine(COPY));</span>
<span class="Special">% Routines.back()->state = COMPLETED;</span>
recipe f1 [
<span class="Constant">1</span>:number<span class="Special"> <- </span>copy <span class="Constant">0</span>
<span class="Constant">2</span>:number<span class="Special"> <- </span>copy <span class="Constant">0</span>
]
<span class="traceContains">+schedule: f1</span>
<span class="traceAbsent">-run: idle</span>
<span class="SalientComment">//:: Routines are marked completed when their parent completes.</span>
<span class="Delimiter">:(scenario scheduler_kills_orphans)</span>
recipe main [
start-running f1:recipe
<span class="Comment"># f1 never actually runs because its parent completes without waiting for it</span>
]
recipe f1 [
<span class="Constant">1</span>:number<span class="Special"> <- </span>copy <span class="Constant">0</span>
]
<span class="traceAbsent">-schedule: f1</span>
<span class="Delimiter">:(before "End Scheduler Cleanup")</span>
for <span class="Delimiter">(</span>long long int i = <span class="Constant">0</span><span class="Delimiter">;</span> i < SIZE<span class="Delimiter">(</span>Routines<span class="Delimiter">);</span> ++i<span class="Delimiter">)</span> <span class="Delimiter">{</span>
if <span class="Delimiter">(</span>Routines<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">)-></span>state == COMPLETED<span class="Delimiter">)</span> <span class="Identifier">continue</span><span class="Delimiter">;</span>
if <span class="Delimiter">(</span>Routines<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">)-></span>parent_index < <span class="Constant">0</span><span class="Delimiter">)</span> <span class="Identifier">continue</span><span class="Delimiter">;</span> <span class="Comment">// root thread</span>
if <span class="Delimiter">(</span>has_completed_parent<span class="Delimiter">(</span>i<span class="Delimiter">))</span> <span class="Delimiter">{</span>
Routines<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">)-></span>state = COMPLETED<span class="Delimiter">;</span>
<span class="Delimiter">}</span>
<span class="Delimiter">}</span>
<span class="Delimiter">:(code)</span>
bool has_completed_parent<span class="Delimiter">(</span>long long int routine_index<span class="Delimiter">)</span> <span class="Delimiter">{</span>
for <span class="Delimiter">(</span>long long int j = routine_index<span class="Delimiter">;</span> j >= <span class="Constant">0</span><span class="Delimiter">;</span> j = Routines<span class="Delimiter">.</span>at<span class="Delimiter">(</span>j<span class="Delimiter">)-></span>parent_index<span class="Delimiter">)</span> <span class="Delimiter">{</span>
if <span class="Delimiter">(</span>Routines<span class="Delimiter">.</span>at<span class="Delimiter">(</span>j<span class="Delimiter">)-></span>state == COMPLETED<span class="Delimiter">)</span>
<span class="Identifier">return</span> <span class="Constant">true</span><span class="Delimiter">;</span>
<span class="Delimiter">}</span>
<span class="Identifier">return</span> <span class="Constant">false</span><span class="Delimiter">;</span>
<span class="Delimiter">}</span>
<span class="SalientComment">//:: 'routine-state' can tell if a given routine id is running</span>
<span class="Delimiter">:(scenario routine_state_test)</span>
<span class="Special">% Scheduling_interval = 2;</span>
recipe f1 [
<span class="Constant">1</span>:number/child-id<span class="Special"> <- </span>start-running f2:recipe
<span class="Constant">12</span>:number<span class="Special"> <- </span>copy <span class="Constant">0</span> <span class="Comment"># race condition since we don't care about location 12</span>
<span class="Comment"># thanks to Scheduling_interval, f2's one instruction runs in between here and completes</span>
<span class="Constant">2</span>:number/state<span class="Special"> <- </span>routine-state <span class="Constant">1</span>:number/child-id
]
recipe f2 [
<span class="Constant">12</span>:number<span class="Special"> <- </span>copy <span class="Constant">0</span>
<span class="Comment"># trying to run a second instruction marks routine as completed</span>
]
<span class="Comment"># recipe f2 should be in state COMPLETED</span>
<span class="traceContains">+mem: storing 1 in location 2</span>
<span class="Delimiter">:(before "End Primitive Recipe Declarations")</span>
ROUTINE_STATE<span class="Delimiter">,</span>
<span class="Delimiter">:(before "End Primitive Recipe Numbers")</span>
Recipe_ordinal[<span class="Constant">"routine-state"</span>] = ROUTINE_STATE<span class="Delimiter">;</span>
<span class="Delimiter">:(before "End Primitive Recipe Implementations")</span>
case ROUTINE_STATE: <span class="Delimiter">{</span>
if <span class="Delimiter">(</span>SIZE<span class="Delimiter">(</span>ingredients<span class="Delimiter">)</span> != <span class="Constant">1</span><span class="Delimiter">)</span> <span class="Delimiter">{</span>
raise << current_recipe_name<span class="Delimiter">()</span> << <span class="Constant">": 'routine-state' requires exactly one ingredient, but got "</span> << current_instruction<span class="Delimiter">().</span>to_string<span class="Delimiter">()</span> << <span class="cSpecial">'\n'</span> << end<span class="Delimiter">();</span>
<span class="Identifier">break</span><span class="Delimiter">;</span>
<span class="Delimiter">}</span>
if <span class="Delimiter">(</span>!scalar<span class="Delimiter">(</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">)))</span> <span class="Delimiter">{</span>
raise << current_recipe_name<span class="Delimiter">()</span> << <span class="Constant">": first ingredient of 'routine-state' should be a routine id generated by 'start-running', but got "</span> << current_instruction<span class="Delimiter">().</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">).</span>original_string << <span class="cSpecial">'\n'</span> << end<span class="Delimiter">();</span>
<span class="Identifier">break</span><span class="Delimiter">;</span>
<span class="Delimiter">}</span>
long long int id = ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">).</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">);</span>
long long int result = -<span class="Constant">1</span><span class="Delimiter">;</span>
for <span class="Delimiter">(</span>long long int i = <span class="Constant">0</span><span class="Delimiter">;</span> i < SIZE<span class="Delimiter">(</span>Routines<span class="Delimiter">);</span> ++i<span class="Delimiter">)</span> <span class="Delimiter">{</span>
if <span class="Delimiter">(</span>Routines<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">)-></span>id == id<span class="Delimiter">)</span> <span class="Delimiter">{</span>
result = Routines<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">)-></span>state<span class="Delimiter">;</span>
<span class="Identifier">break</span><span class="Delimiter">;</span>
<span class="Delimiter">}</span>
<span class="Delimiter">}</span>
products<span class="Delimiter">.</span>resize<span class="Delimiter">(</span><span class="Constant">1</span><span class="Delimiter">);</span>
products<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">).</span>push_back<span class="Delimiter">(</span>result<span class="Delimiter">);</span>
<span class="Identifier">break</span><span class="Delimiter">;</span>
<span class="Delimiter">}</span>
<span class="SalientComment">//:: miscellaneous helpers</span>
<span class="Delimiter">:(before "End Primitive Recipe Declarations")</span>
RESTART<span class="Delimiter">,</span>
<span class="Delimiter">:(before "End Primitive Recipe Numbers")</span>
Recipe_ordinal[<span class="Constant">"restart"</span>] = RESTART<span class="Delimiter">;</span>
<span class="Delimiter">:(before "End Primitive Recipe Implementations")</span>
case RESTART: <span class="Delimiter">{</span>
if <span class="Delimiter">(</span>SIZE<span class="Delimiter">(</span>ingredients<span class="Delimiter">)</span> != <span class="Constant">1</span><span class="Delimiter">)</span> <span class="Delimiter">{</span>
raise << current_recipe_name<span class="Delimiter">()</span> << <span class="Constant">": 'restart' requires exactly one ingredient, but got "</span> << current_instruction<span class="Delimiter">().</span>to_string<span class="Delimiter">()</span> << <span class="cSpecial">'\n'</span> << end<span class="Delimiter">();</span>
<span class="Identifier">break</span><span class="Delimiter">;</span>
<span class="Delimiter">}</span>
if <span class="Delimiter">(</span>!scalar<span class="Delimiter">(</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">)))</span> <span class="Delimiter">{</span>
raise << current_recipe_name<span class="Delimiter">()</span> << <span class="Constant">": first ingredient of 'restart' should be a routine id generated by 'start-running', but got "</span> << current_instruction<span class="Delimiter">().</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">).</span>original_string << <span class="cSpecial">'\n'</span> << end<span class="Delimiter">();</span>
<span class="Identifier">break</span><span class="Delimiter">;</span>
<span class="Delimiter">}</span>
long long int id = ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">).</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">);</span>
for <span class="Delimiter">(</span>long long int i = <span class="Constant">0</span><span class="Delimiter">;</span> i < SIZE<span class="Delimiter">(</span>Routines<span class="Delimiter">);</span> ++i<span class="Delimiter">)</span> <span class="Delimiter">{</span>
if <span class="Delimiter">(</span>Routines<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">)-></span>id == id<span class="Delimiter">)</span> <span class="Delimiter">{</span>
Routines<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">)-></span>state = RUNNING<span class="Delimiter">;</span>
<span class="Identifier">break</span><span class="Delimiter">;</span>
<span class="Delimiter">}</span>
<span class="Delimiter">}</span>
<span class="Identifier">break</span><span class="Delimiter">;</span>
<span class="Delimiter">}</span>
<span class="Delimiter">:(before "End Primitive Recipe Declarations")</span>
STOP<span class="Delimiter">,</span>
<span class="Delimiter">:(before "End Primitive Recipe Numbers")</span>
Recipe_ordinal[<span class="Constant">"stop"</span>] = STOP<span class="Delimiter">;</span>
<span class="Delimiter">:(before "End Primitive Recipe Implementations")</span>
case STOP: <span class="Delimiter">{</span>
if <span class="Delimiter">(</span>SIZE<span class="Delimiter">(</span>ingredients<span class="Delimiter">)</span> != <span class="Constant">1</span><span class="Delimiter">)</span> <span class="Delimiter">{</span>
raise << current_recipe_name<span class="Delimiter">()</span> << <span class="Constant">": 'stop' requires exactly one ingredient, but got "</span> << current_instruction<span class="Delimiter">().</span>to_string<span class="Delimiter">()</span> << <span class="cSpecial">'\n'</span> << end<span class="Delimiter">();</span>
<span class="Identifier">break</span><span class="Delimiter">;</span>
<span class="Delimiter">}</span>
if <span class="Delimiter">(</span>!scalar<span class="Delimiter">(</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">)))</span> <span class="Delimiter">{</span>
raise << current_recipe_name<span class="Delimiter">()</span> << <span class="Constant">": first ingredient of 'stop' should be a routine id generated by 'start-running', but got "</span> << current_instruction<span class="Delimiter">().</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">).</span>original_string << <span class="cSpecial">'\n'</span> << end<span class="Delimiter">();</span>
<span class="Identifier">break</span><span class="Delimiter">;</span>
<span class="Delimiter">}</span>
long long int id = ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">).</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">);</span>
for <span class="Delimiter">(</span>long long int i = <span class="Constant">0</span><span class="Delimiter">;</span> i < SIZE<span class="Delimiter">(</span>Routines<span class="Delimiter">);</span> ++i<span class="Delimiter">)</span> <span class="Delimiter">{</span>
if <span class="Delimiter">(</span>Routines<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">)-></span>id == id<span class="Delimiter">)</span> <span class="Delimiter">{</span>
Routines<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">)-></span>state = COMPLETED<span class="Delimiter">;</span>
<span class="Identifier">break</span><span class="Delimiter">;</span>
<span class="Delimiter">}</span>
<span class="Delimiter">}</span>
<span class="Identifier">break</span><span class="Delimiter">;</span>
<span class="Delimiter">}</span>
<span class="Delimiter">:(before "End Primitive Recipe Declarations")</span>
_DUMP_ROUTINES<span class="Delimiter">,</span>
<span class="Delimiter">:(before "End Primitive Recipe Numbers")</span>
Recipe_ordinal[<span class="Constant">"$dump-routines"</span>] = _DUMP_ROUTINES<span class="Delimiter">;</span>
<span class="Delimiter">:(before "End Primitive Recipe Implementations")</span>
case _DUMP_ROUTINES: <span class="Delimiter">{</span>
for <span class="Delimiter">(</span>long long int i = <span class="Constant">0</span><span class="Delimiter">;</span> i < SIZE<span class="Delimiter">(</span>Routines<span class="Delimiter">);</span> ++i<span class="Delimiter">)</span> <span class="Delimiter">{</span>
cerr << i << <span class="Constant">": "</span> << Routines<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">)-></span>id << <span class="Constant">' '</span> << Routines<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">)-></span>state << <span class="Constant">' '</span> << Routines<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">)-></span>parent_index << <span class="cSpecial">'\n'</span><span class="Delimiter">;</span>
<span class="Delimiter">}</span>
<span class="Identifier">break</span><span class="Delimiter">;</span>
<span class="Delimiter">}</span>
<span class="Comment">//: support for stopping routines after some number of cycles</span>
<span class="Delimiter">:(scenario routine_discontinues_past_limit)</span>
<span class="Special">% Scheduling_interval = 2;</span>
recipe f1 [
<span class="Constant">1</span>:number/child-id<span class="Special"> <- </span>start-running f2:recipe
limit-time <span class="Constant">1</span>:number/child-id<span class="Delimiter">,</span> <span class="Constant">10</span>
<span class="Comment"># padding loop just to make sure f2 has time to completed</span>
<span class="Constant">2</span>:number<span class="Special"> <- </span>copy <span class="Constant">20</span>
<span class="Constant">2</span>:number<span class="Special"> <- </span>subtract <span class="Constant">2</span>:number<span class="Delimiter">,</span> <span class="Constant">1</span>
jump-if <span class="Constant">2</span>:number<span class="Delimiter">,</span> -<span class="Constant">2</span>:offset
]
recipe f2 [
jump -<span class="Constant">1</span>:offset <span class="Comment"># run forever</span>
$print [should never get here]<span class="Delimiter">,</span> <span class="Constant">10</span>/newline
]
<span class="Comment"># f2 terminates</span>
<span class="traceContains">+schedule: discontinuing routine 2</span>
<span class="Delimiter">:(before "End routine States")</span>
DISCONTINUED<span class="Delimiter">,</span>
<span class="Delimiter">:(before "End Scheduler State Transitions")</span>
if <span class="Delimiter">(</span>Current_routine<span class="Delimiter">-></span>limit >= <span class="Constant">0</span><span class="Delimiter">)</span> <span class="Delimiter">{</span>
if <span class="Delimiter">(</span>Current_routine<span class="Delimiter">-></span>limit <= Scheduling_interval<span class="Delimiter">)</span> <span class="Delimiter">{</span>
trace<span class="Delimiter">(</span><span class="Constant">"schedule"</span><span class="Delimiter">)</span> << <span class="Constant">"discontinuing routine "</span> << Current_routine<span class="Delimiter">-></span>id << end<span class="Delimiter">();</span>
Current_routine<span class="Delimiter">-></span>state = DISCONTINUED<span class="Delimiter">;</span>
Current_routine<span class="Delimiter">-></span>limit = <span class="Constant">0</span><span class="Delimiter">;</span>
<span class="Delimiter">}</span>
else <span class="Delimiter">{</span>
Current_routine<span class="Delimiter">-></span>limit -= Scheduling_interval<span class="Delimiter">;</span>
<span class="Delimiter">}</span>
<span class="Delimiter">}</span>
<span class="Delimiter">:(before "End routine Fields")</span>
long long int limit<span class="Delimiter">;</span>
<span class="Delimiter">:(before "End routine Constructor")</span>
limit = -<span class="Constant">1</span><span class="Delimiter">;</span> <span class="Comment">/*</span><span class="Comment"> no limit </span><span class="Comment">*/</span>
<span class="Delimiter">:(before "End Primitive Recipe Declarations")</span>
LIMIT_TIME<span class="Delimiter">,</span>
<span class="Delimiter">:(before "End Primitive Recipe Numbers")</span>
Recipe_ordinal[<span class="Constant">"limit-time"</span>] = LIMIT_TIME<span class="Delimiter">;</span>
<span class="Delimiter">:(before "End Primitive Recipe Implementations")</span>
case LIMIT_TIME: <span class="Delimiter">{</span>
if <span class="Delimiter">(</span>SIZE<span class="Delimiter">(</span>ingredients<span class="Delimiter">)</span> != <span class="Constant">2</span><span class="Delimiter">)</span> <span class="Delimiter">{</span>
raise << current_recipe_name<span class="Delimiter">()</span> << <span class="Constant">": 'limit-time' requires exactly two ingredient, but got "</span> << current_instruction<span class="Delimiter">().</span>to_string<span class="Delimiter">()</span> << <span class="cSpecial">'\n'</span> << end<span class="Delimiter">();</span>
<span class="Identifier">break</span><span class="Delimiter">;</span>
<span class="Delimiter">}</span>
if <span class="Delimiter">(</span>!scalar<span class="Delimiter">(</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">)))</span> <span class="Delimiter">{</span>
raise << current_recipe_name<span class="Delimiter">()</span> << <span class="Constant">": first ingredient of 'limit-time' should be a routine id generated by 'start-running', but got "</span> << current_instruction<span class="Delimiter">().</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">).</span>original_string << <span class="cSpecial">'\n'</span> << end<span class="Delimiter">();</span>
<span class="Identifier">break</span><span class="Delimiter">;</span>
<span class="Delimiter">}</span>
if <span class="Delimiter">(</span>!scalar<span class="Delimiter">(</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">1</span><span class="Delimiter">)))</span> <span class="Delimiter">{</span>
raise << current_recipe_name<span class="Delimiter">()</span> << <span class="Constant">": second ingredient of 'limit-time' should be a number (of instructions to run for), but got "</span> << current_instruction<span class="Delimiter">().</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">1</span><span class="Delimiter">).</span>original_string << <span class="cSpecial">'\n'</span> << end<span class="Delimiter">();</span>
<span class="Identifier">break</span><span class="Delimiter">;</span>
<span class="Delimiter">}</span>
long long int id = ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">).</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">);</span>
for <span class="Delimiter">(</span>long long int i = <span class="Constant">0</span><span class="Delimiter">;</span> i < SIZE<span class="Delimiter">(</span>Routines<span class="Delimiter">);</span> ++i<span class="Delimiter">)</span> <span class="Delimiter">{</span>
if <span class="Delimiter">(</span>Routines<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">)-></span>id == id<span class="Delimiter">)</span> <span class="Delimiter">{</span>
Routines<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">)-></span>limit = ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">1</span><span class="Delimiter">).</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">);</span>
<span class="Identifier">break</span><span class="Delimiter">;</span>
<span class="Delimiter">}</span>
<span class="Delimiter">}</span>
<span class="Identifier">break</span><span class="Delimiter">;</span>
<span class="Delimiter">}</span>
</pre>
</body>
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