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Copy pathlocks.nim
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70 lines (54 loc) · 1.74 KB
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#
#
# Nim's Runtime Library
# (c) Copyright 2015 Andreas Rumpf
#
# See the file "copying.txt", included in this
# distribution, for details about the copyright.
#
## This module contains Nim's support for locks and condition vars.
const insideRLocksModule = false
include "system/syslocks"
type
Lock* = SysLock ## Nim lock; whether this is re-entrant
## or not is unspecified!
Cond* = SysCond ## Nim condition variable
{.push stackTrace: off.}
proc initLock*(lock: var Lock) {.inline.} =
## Initializes the given lock.
initSysLock(lock)
proc deinitLock*(lock: var Lock) {.inline.} =
## Frees the resources associated with the lock.
deinitSys(lock)
proc tryAcquire*(lock: var Lock): bool =
## Tries to acquire the given lock. Returns `true` on success.
result = tryAcquireSys(lock)
proc acquire*(lock: var Lock) =
## Acquires the given lock.
acquireSys(lock)
proc release*(lock: var Lock) =
## Releases the given lock.
releaseSys(lock)
proc initCond*(cond: var Cond) {.inline.} =
## Initializes the given condition variable.
initSysCond(cond)
proc deinitCond*(cond: var Cond) {.inline.} =
## Frees the resources associated with the lock.
deinitSysCond(cond)
proc wait*(cond: var Cond, lock: var Lock) {.inline.} =
## waits on the condition variable `cond`.
waitSysCond(cond, lock)
proc signal*(cond: var Cond) {.inline.} =
## sends a signal to the condition variable `cond`.
signalSysCond(cond)
template withLock*(a: Lock, body: untyped) =
## Acquires the given lock, executes the statements in body and
## releases the lock after the statements finish executing.
mixin acquire, release
a.acquire()
{.locks: [a].}:
try:
body
finally:
a.release()
{.pop.}