NSLock: lock(before:) - Add some precondition() tests
diff --git a/Foundation/NSLock.swift b/Foundation/NSLock.swift
index 588a704..886b5ba 100644
--- a/Foundation/NSLock.swift
+++ b/Foundation/NSLock.swift
@@ -320,12 +320,22 @@
var timeSpec = timeSpecFrom(date: endTime)
while var ts = timeSpec {
- pthread_mutex_lock(timeoutMutex)
- pthread_cond_timedwait(timeoutCond, timeoutMutex, &ts)
- pthread_mutex_unlock(timeoutMutex)
- if pthread_mutex_trylock(mutex) == 0 {
+ let lockval = pthread_mutex_lock(timeoutMutex)
+ precondition(lockval == 0)
+ let waitval = pthread_cond_timedwait(timeoutCond, timeoutMutex, &ts)
+ precondition(waitval == 0 || waitval == ETIMEDOUT)
+ let unlockval = pthread_mutex_unlock(timeoutMutex)
+ precondition(unlockval == 0)
+
+ if waitval == ETIMEDOUT {
+ return false
+ }
+ let tryval = pthread_mutex_trylock(mutex)
+ precondition(tryval == 0 || tryval == EBUSY)
+ if tryval == 0 { // The lock was obtained.
return true
}
+ // pthread_cond_timedwait didnt timeout so wait some more.
timeSpec = timeSpecFrom(date: endTime)
}
return false
