diff options
Diffstat (limited to 'gcell/ibm/sync/spu_source/read_trylock.h')
| -rw-r--r-- | gcell/ibm/sync/spu_source/read_trylock.h | 71 |
1 files changed, 71 insertions, 0 deletions
diff --git a/gcell/ibm/sync/spu_source/read_trylock.h b/gcell/ibm/sync/spu_source/read_trylock.h new file mode 100644 index 000000000..d03278351 --- /dev/null +++ b/gcell/ibm/sync/spu_source/read_trylock.h @@ -0,0 +1,71 @@ +/* -------------------------------------------------------------- */ +/* (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 _SPU_READ_TRYLOCK_H_ +#define _SPU_READ_TRYLOCK_H_ + +#include "sync_utils.h" +#include "mutex.h" + +/** + * read_trylock - acquire a reader lock, or return immediately. + * @ea: handle to effective address of lock variable. + * + * Acquire a non-exclusive reader lock, or return + * immediately. The only restriction here is that + * @ea must be word aligned. + * + * Returns 1 on success, or 0 on failure. + * + * Context: The application should not call this interface + * from a tight loop!! Use read_lock() instead. + */ +static __inline int _read_trylock(eaddr_t ea) +{ + DECL_MUTEX_VARS(); + s32 status, ret_val; + + RAW_TEST_AND_SET(>=, 1); + + return ret_val; +} + + +#endif /* _SPU_READ_TRYLOCK_H_ */ |