diff options
Diffstat (limited to 'gcell/src/ibm/sync/ppu_source/mutex_trylock.h')
| -rw-r--r-- | gcell/src/ibm/sync/ppu_source/mutex_trylock.h | 81 |
1 files changed, 81 insertions, 0 deletions
diff --git a/gcell/src/ibm/sync/ppu_source/mutex_trylock.h b/gcell/src/ibm/sync/ppu_source/mutex_trylock.h new file mode 100644 index 0000000000..445196c745 --- /dev/null +++ b/gcell/src/ibm/sync/ppu_source/mutex_trylock.h @@ -0,0 +1,81 @@ +/* -------------------------------------------------------------- */ +/* (C)Copyright 2001,2007, */ +/* International Business Machines Corporation, */ +/* Sony Computer Entertainment, Incorporated, */ +/* Toshiba Corporation, */ +/* */ +/* All Rights Reserved. */ +/* */ +/* Redistribution and use in source and binary forms, with or */ +/* without modification, are permitted provided that the */ +/* following conditions are met: */ +/* */ +/* - Redistributions of source code must retain the above copyright*/ +/* notice, this list of conditions and the following disclaimer. */ +/* */ +/* - Redistributions in binary form must reproduce the above */ +/* copyright notice, this list of conditions and the following */ +/* disclaimer in the documentation and/or other materials */ +/* provided with the distribution. */ +/* */ +/* - Neither the name of IBM Corporation nor the names of its */ +/* contributors may be used to endorse or promote products */ +/* derived from this software without specific prior written */ +/* permission. */ +/* */ +/* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND */ +/* CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, */ +/* INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF */ +/* MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE */ +/* DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR */ +/* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, */ +/* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT */ +/* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; */ +/* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) */ +/* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN */ +/* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR */ +/* OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, */ +/* EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. */ +/* -------------------------------------------------------------- */ +/* PROLOG END TAG zYx */ +#ifndef _PPU_MUTEX_TRYLOCK_H_ +#define _PPU_MUTEX_TRYLOCK_H_ + +#include <ppu_intrinsics.h> +#include "sync_utils.h" +#include "mutex.h" +#include "trace_libsync.h" + +/** + * mutex_trylock - acquire a lock, or return immediately. + * @lock: handle to effective address of lock variable. + * + * Description: Acquire a lock, or return immediately + * without polling for availability. + * + * Context: The application should not call this interface + * from a tight loop!! Use spin_lock() instead. + * + * Attempt to immediately aquire a lock at a location in system memory, + * and return 1 if the lock was aquired or 0 otherwise. + */ +static __inline int _mutex_trylock (mutex_ea_t lock) +{ + int val; + int ret = 0; + void *p; + + SYNC_ULL_TO_PTR(lock, p); + + do { + val = (int)__lwarx(p); + if (val) break; + } while ((ret = __stwcx(p, (unsigned int)1)) == 0); + __isync(); + + TRACE_MUTEX_TRYLOCK(lock,ret); + + return (ret); +} + +#endif /* _PPU_MUTEX_TRYLOCK_H_ */ |