813d4cbe94
locks. * Added syscalls for a new kind of mutex. A mutex consists only of an int32 and doesn't require any kernel resources. So it's initialization cannot fail (it consists only of setting the mutex value to 0). An uncontended lock or unlock operation can basically consist of an atomic_*() in userland. The syscalls (when the mutex is contended) are a bit more expensive than semaphore operations, though. git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@36158 a95241bf-73f2-0310-859d-f6bbb57e9c96
22 lines
562 B
C
22 lines
562 B
C
/*
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* Copyright 2010, Ingo Weinhold, ingo_weinhold@gmx.de.
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* Distributed under the terms of the MIT License.
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*/
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#ifndef _SYSTEM_USER_MUTEX_DEFS_H
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#define _SYSTEM_USER_MUTEX_DEFS_H
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// user mutex specific flags passed to _kern_user_mutex_unlock()
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#define B_USER_MUTEX_UNBLOCK_ALL 0x80000000
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// All threads currently waiting on the mutex will be unblocked. The mutex
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// state will be locked.
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// mutex value flags
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#define B_USER_MUTEX_LOCKED 0x01
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#define B_USER_MUTEX_WAITING 0x02
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#define B_USER_MUTEX_DISABLED 0x04
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#endif /* _SYSTEM_USER_MUTEX_DEFS_H */
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