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#
#
# Nim's Runtime Library
# (c) Copyright 2016 Anatoly Galiulin
#
# See the file "copying.txt", included in this
# distribution, for details about the copyright.
#
## This module contains Nim's support for reentrant locks.
when not compileOption("threads") and not defined(nimdoc):
when false:
# make rlocks modlue consistent with locks module,
# so they can replace each other seamlessly.
{.error: "Rlocks requires --threads:on option.".}
import std/private/syslocks
type
RLock* = SysLock ## Nim lock, re-entrant
proc initRLock*(lock: var RLock) {.inline.} =
## Initializes the given lock.
when defined(posix):
var a: SysLockAttr
initSysLockAttr(a)
setSysLockType(a, SysLockType_Reentrant)
initSysLock(lock, a.addr)
else:
initSysLock(lock)
proc deinitRLock*(lock: RLock) {.inline.} =
## Frees the resources associated with the lock.
deinitSys(lock)
proc tryAcquire*(lock: var RLock): bool {.inline.} =
## Tries to acquire the given lock. Returns `true` on success.
result = tryAcquireSys(lock)
proc acquire*(lock: var RLock) {.inline.} =
## Acquires the given lock.
acquireSys(lock)
proc release*(lock: var RLock) {.inline.} =
## Releases the given lock.
releaseSys(lock)
template withRLock*(lock: RLock, code: untyped) =
## Acquires the given lock and then executes the code.
acquire(lock)
{.locks: [lock].}:
try:
code
finally:
release(lock)
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