diff options
Diffstat (limited to 'gcell/src/ibm/sync/ppu_source/cond_wait.h')
| -rw-r--r-- | gcell/src/ibm/sync/ppu_source/cond_wait.h | 96 |
1 files changed, 96 insertions, 0 deletions
diff --git a/gcell/src/ibm/sync/ppu_source/cond_wait.h b/gcell/src/ibm/sync/ppu_source/cond_wait.h new file mode 100644 index 0000000000..ed5fbecb11 --- /dev/null +++ b/gcell/src/ibm/sync/ppu_source/cond_wait.h @@ -0,0 +1,96 @@ +/* -------------------------------------------------------------- */ +/* (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_COND_WAIT_H_ +#define _PPU_COND_WAIT_H_ + +#include <ppu_intrinsics.h> +#include "sync_utils.h" +#include "mutex_lock.h" +#include "mutex_unlock.h" +#include "cond.h" + +static __inline void _cond_wait (cond_ea_t cond, mutex_ea_t mutex) +{ + int delta, cur_delta; + unsigned int val, cond_val, signaled_cnt; + void *p; + + + SYNC_ULL_TO_PTR(cond, p); + + /* Atomically signal we have entered the condition wait by incrementing + * the waiting count. + */ + do { + val = __lwarx(p); + val = (val & ~0xFFFF) | ((val+1) & 0xFFFF); + } while (__stwcx(p, val) == 0); + + + /* Release the lock + */ + _mutex_unlock (mutex); + + /* Determine the signal count needed for this + * participant to be signaled. + */ + + signaled_cnt = val >> 16; + delta = (int)(val & 0xFFFF) - (int)signaled_cnt; + if (delta < 0) delta = -delta; + + /* Wait until the signaled count reaches the count + * previously determined. + */ + do { + cond_val = __lwarx(p); + + cur_delta = (int)(cond_val >> 16) - signaled_cnt; + if (cur_delta < 0) cur_delta = -cur_delta; + + } while (cur_delta < delta); + + /* Relock the mutex + */ + _mutex_lock (mutex); +} + +#endif /* _PPU_COND_WAIT_H_ */ |