1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
|
#
#
# Nim's Runtime Library
# (c) Copyright 2012 Andreas Rumpf
#
# See the file "copying.txt", included in this
# distribution, for details about the copyright.
#
# Low level system locks and condition vars.
{.push stackTrace: off.}
when defined(Windows):
type
Handle = int
SysLock {.importc: "CRITICAL_SECTION",
header: "<windows.h>", final, pure.} = object # CRITICAL_SECTION in WinApi
DebugInfo: pointer
LockCount: int32
RecursionCount: int32
OwningThread: int
LockSemaphore: int
SpinCount: int
SysCond = Handle
proc initSysLock(L: var SysLock) {.importc: "InitializeCriticalSection",
header: "<windows.h>".}
## Initializes the lock `L`.
proc tryAcquireSysAux(L: var SysLock): int32 {.importc: "TryEnterCriticalSection",
header: "<windows.h>".}
## Tries to acquire the lock `L`.
proc tryAcquireSys(L: var SysLock): bool {.inline.} =
result = tryAcquireSysAux(L) != 0'i32
proc acquireSys(L: var SysLock) {.importc: "EnterCriticalSection",
header: "<windows.h>".}
## Acquires the lock `L`.
proc releaseSys(L: var SysLock) {.importc: "LeaveCriticalSection",
header: "<windows.h>".}
## Releases the lock `L`.
proc deinitSys(L: var SysLock) {.importc: "DeleteCriticalSection",
header: "<windows.h>".}
proc createEvent(lpEventAttributes: pointer,
bManualReset, bInitialState: int32,
lpName: cstring): SysCond {.stdcall, noSideEffect,
dynlib: "kernel32", importc: "CreateEventA".}
proc closeHandle(hObject: Handle) {.stdcall, noSideEffect,
dynlib: "kernel32", importc: "CloseHandle".}
proc waitForSingleObject(hHandle: Handle, dwMilliseconds: int32): int32 {.
stdcall, dynlib: "kernel32", importc: "WaitForSingleObject", noSideEffect.}
proc signalSysCond(hEvent: SysCond) {.stdcall, noSideEffect,
dynlib: "kernel32", importc: "SetEvent".}
proc initSysCond(cond: var SysCond) {.inline.} =
cond = createEvent(nil, 0'i32, 0'i32, nil)
proc deinitSysCond(cond: var SysCond) {.inline.} =
closeHandle(cond)
proc waitSysCond(cond: var SysCond, lock: var SysLock) =
releaseSys(lock)
discard waitForSingleObject(cond, -1'i32)
acquireSys(lock)
proc waitSysCondWindows(cond: var SysCond) =
discard waitForSingleObject(cond, -1'i32)
elif defined(genode):
const
Header = "genode_cpp/syslocks.h"
type
SysLock {.importcpp: "Nim::SysLock", pure, final,
header: Header.} = object
SysCond {.importcpp: "Nim::SysCond", pure, final,
header: Header.} = object
proc initSysLock(L: var SysLock) = discard
proc deinitSys(L: var SysLock) = discard
proc acquireSys(L: var SysLock) {.noSideEffect, importcpp.}
proc tryAcquireSys(L: var SysLock): bool {.noSideEffect, importcpp.}
proc releaseSys(L: var SysLock) {.noSideEffect, importcpp.}
proc initSysCond(L: var SysCond) = discard
proc deinitSysCond(L: var SysCond) = discard
proc waitSysCond(cond: var SysCond, lock: var SysLock) {.
noSideEffect, importcpp.}
proc signalSysCond(cond: var SysCond) {.
noSideEffect, importcpp.}
else:
type
SysLockObj {.importc: "pthread_mutex_t", pure, final,
header: """#include <sys/types.h>
#include <pthread.h>""".} = object
when defined(linux) and defined(amd64):
abi: array[40 div sizeof(clong), clong]
SysLockAttr {.importc: "pthread_mutexattr_t", pure, final
header: """#include <sys/types.h>
#include <pthread.h>""".} = object
when defined(linux) and defined(amd64):
abi: array[4 div sizeof(cint), cint] # actually a cint
SysCondObj {.importc: "pthread_cond_t", pure, final,
header: """#include <sys/types.h>
#include <pthread.h>""".} = object
when defined(linux) and defined(amd64):
abi: array[48 div sizeof(clonglong), clonglong]
SysCondAttr {.importc: "pthread_condattr_t", pure, final
header: """#include <sys/types.h>
#include <pthread.h>""".} = object
when defined(linux) and defined(amd64):
abi: array[4 div sizeof(cint), cint] # actually a cint
SysLockType = distinct cint
proc initSysLockAux(L: var SysLockObj, attr: ptr SysLockAttr) {.
importc: "pthread_mutex_init", header: "<pthread.h>", noSideEffect.}
proc deinitSysAux(L: var SysLockObj) {.noSideEffect,
importc: "pthread_mutex_destroy", header: "<pthread.h>".}
proc acquireSysAux(L: var SysLockObj) {.noSideEffect,
importc: "pthread_mutex_lock", header: "<pthread.h>".}
proc tryAcquireSysAux(L: var SysLockObj): cint {.noSideEffect,
importc: "pthread_mutex_trylock", header: "<pthread.h>".}
proc releaseSysAux(L: var SysLockObj) {.noSideEffect,
importc: "pthread_mutex_unlock", header: "<pthread.h>".}
when defined(ios):
# iOS will behave badly if sync primitives are moved in memory. In order
# to prevent this once and for all, we're doing an extra malloc when
# initializing the primitive.
type
SysLock = ptr SysLockObj
SysCond = ptr SysCondObj
when not declared(c_malloc):
proc c_malloc(size: csize): pointer {.
importc: "malloc", header: "<stdlib.h>".}
proc c_free(p: pointer) {.
importc: "free", header: "<stdlib.h>".}
proc initSysLock(L: var SysLock, attr: ptr SysLockAttr = nil) =
L = cast[SysLock](c_malloc(sizeof(SysLockObj)))
initSysLockAux(L[], attr)
proc deinitSys(L: var SysLock) =
deinitSysAux(L[])
c_free(L)
template acquireSys(L: var SysLock) =
acquireSysAux(L[])
template tryAcquireSys(L: var SysLock): bool =
tryAcquireSysAux(L[]) == 0'i32
template releaseSys(L: var SysLock) =
releaseSysAux(L[])
else:
type
SysLock = SysLockObj
SysCond = SysCondObj
template initSysLock(L: var SysLock, attr: ptr SysLockAttr = nil) =
initSysLockAux(L, attr)
template deinitSys(L: var SysLock) =
deinitSysAux(L)
template acquireSys(L: var SysLock) =
acquireSysAux(L)
template tryAcquireSys(L: var SysLock): bool =
tryAcquireSysAux(L) == 0'i32
template releaseSys(L: var SysLock) =
releaseSysAux(L)
when insideRLocksModule:
proc SysLockType_Reentrant: SysLockType =
{.emit: "`result` = PTHREAD_MUTEX_RECURSIVE;".}
proc initSysLockAttr(a: var SysLockAttr) {.
importc: "pthread_mutexattr_init", header: "<pthread.h>", noSideEffect.}
proc setSysLockType(a: var SysLockAttr, t: SysLockType) {.
importc: "pthread_mutexattr_settype", header: "<pthread.h>", noSideEffect.}
else:
proc initSysCondAux(cond: var SysCondObj, cond_attr: ptr SysCondAttr = nil) {.
importc: "pthread_cond_init", header: "<pthread.h>", noSideEffect.}
proc deinitSysCondAux(cond: var SysCondObj) {.noSideEffect,
importc: "pthread_cond_destroy", header: "<pthread.h>".}
proc waitSysCondAux(cond: var SysCondObj, lock: var SysLockObj) {.
importc: "pthread_cond_wait", header: "<pthread.h>", noSideEffect.}
proc signalSysCondAux(cond: var SysCondObj) {.
importc: "pthread_cond_signal", header: "<pthread.h>", noSideEffect.}
when defined(ios):
proc initSysCond(cond: var SysCond, cond_attr: ptr SysCondAttr = nil) =
cond = cast[SysCond](c_malloc(sizeof(SysCondObj)))
initSysCondAux(cond[], cond_attr)
proc deinitSysCond(cond: var SysCond) =
deinitSysCondAux(cond[])
c_free(cond)
template waitSysCond(cond: var SysCond, lock: var SysLock) =
waitSysCondAux(cond[], lock[])
template signalSysCond(cond: var SysCond) =
signalSysCondAux(cond[])
else:
template initSysCond(cond: var SysCond, cond_attr: ptr SysCondAttr = nil) =
initSysCondAux(cond, cond_attr)
template deinitSysCond(cond: var SysCond) =
deinitSysCondAux(cond)
template waitSysCond(cond: var SysCond, lock: var SysLock) =
waitSysCondAux(cond, lock)
template signalSysCond(cond: var SysCond) =
signalSysCondAux(cond)
{.pop.}
|