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Added rw_lock_read_lock_with_timeout().

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git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@37680 a95241bf-73f2-0310-859d-f6bbb57e9c96
This commit is contained in:
Ingo Weinhold
2010-07-22 11:10:48 +00:00
parent b349aae941
commit 4e08fb8589
3 changed files with 196 additions and 3 deletions
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headers/private/kernel/lock.h
+18 -1
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@@ -1,5 +1,5 @@
/*
* Copyright 2008-2009, Ingo Weinhold, [email protected].
* Copyright 2008-2010, Ingo Weinhold, [email protected].
* Copyright 2002-2009, Axel Dörfler, [email protected].
* Distributed under the terms of the MIT License.
*
@@ -142,6 +142,8 @@ extern status_t mutex_switch_from_read_lock(rw_lock* from, mutex* to);
// implementation private:
extern status_t _rw_lock_read_lock(rw_lock* lock);
extern status_t _rw_lock_read_lock_with_timeout(rw_lock* lock,
uint32 timeoutFlags, bigtime_t timeout);
extern void _rw_lock_read_unlock(rw_lock* lock, bool threadsLocked);
extern void _rw_lock_write_unlock(rw_lock* lock, bool threadsLocked);
@@ -166,6 +168,21 @@ rw_lock_read_lock(rw_lock* lock)
}
static inline status_t
rw_lock_read_lock_with_timeout(rw_lock* lock, uint32 timeoutFlags,
bigtime_t timeout)
{
#if KDEBUG_RW_LOCK_DEBUG
return mutex_lock_with_timeout(lock, timeoutFlags, timeout);
#else
int32 oldCount = atomic_add(&lock->count, 1);
if (oldCount >= RW_LOCK_WRITER_COUNT_BASE)
return _rw_lock_read_lock_with_timeout(lock, timeoutFlags, timeout);
return B_OK;
#endif
}
static inline void
rw_lock_read_unlock(rw_lock* lock)
{