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39 /* -------------------------------------------------------------- */
40 /* PROLOG END TAG zYx */
41 #ifndef _PPU_COND_WAIT_H_
42 #define _PPU_COND_WAIT_H_
44 #include <ppu_intrinsics.h>
45 #include "sync_utils.h"
46 #include "mutex_lock.h"
47 #include "mutex_unlock.h"
50 static __inline void _cond_wait (cond_ea_t cond, mutex_ea_t mutex)
53 unsigned int val, cond_val, signaled_cnt;
57 SYNC_ULL_TO_PTR(cond, p);
59 /* Atomically signal we have entered the condition wait by incrementing
64 val = (val & ~0xFFFF) | ((val+1) & 0xFFFF);
65 } while (__stwcx(p, val) == 0);
70 _mutex_unlock (mutex);
72 /* Determine the signal count needed for this
73 * participant to be signaled.
76 signaled_cnt = val >> 16;
77 delta = (int)(val & 0xFFFF) - (int)signaled_cnt;
78 if (delta < 0) delta = -delta;
80 /* Wait until the signaled count reaches the count
81 * previously determined.
84 cond_val = __lwarx(p);
86 cur_delta = (int)(cond_val >> 16) - signaled_cnt;
87 if (cur_delta < 0) cur_delta = -cur_delta;
89 } while (cur_delta < delta);
96 #endif /* _PPU_COND_WAIT_H_ */