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new futex-requeue-based pthread_cond_broadcast implementation

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this avoids the "stampede effect" where pthread_cond_broadcast would
result in all waiters waking up simultaneously, only to immediately
contend for the mutex and go back to sleep.
This commit is contained in:
Rich Felker
2011-09-25 02:38:03 -04:00
parent 97c5b5a87c
commit cba4e1c0a3
4 changed files with 69 additions and 7 deletions
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src/internal/pthread_impl.h
+6 -3
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@@ -64,9 +64,12 @@ struct __timer {
#define _m_prev __u.__p[3]
#define _m_next __u.__p[4]
#define _m_count __u.__i[5]
#define _c_block __u.__i[0]
#define _c_clock __u.__i[1]
#define _c_waiters __u.__i[2]
#define _c_mutex __u.__p[0]
#define _c_block __u.__i[2]
#define _c_waiters __u.__i[3]
#define _c_clock __u.__i[4]
#define _c_bcast __u.__i[5]
#define _c_leavers __u.__i[6]
#define _rw_lock __u.__i[0]
#define _rw_waiters __u.__i[1]
#define _b_inst __u.__p[0]