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authorRich Felker <dalias@aerifal.cx>2011-09-25 02:38:03 -0400
committerRich Felker <dalias@aerifal.cx>2011-09-25 02:38:03 -0400
commitcba4e1c0a3423ed07ef5c79f6e29360996f32fd7 (patch)
treeb0b71361525510d796f448dd506d8f8f6140ca41 /src/internal
parent97c5b5a87c3d9df54278e1073d6177f77536bd32 (diff)
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new futex-requeue-based pthread_cond_broadcast implementation
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.
Diffstat (limited to 'src/internal')
-rw-r--r--src/internal/pthread_impl.h9
1 files changed, 6 insertions, 3 deletions
diff --git a/src/internal/pthread_impl.h b/src/internal/pthread_impl.h
index d123e5e3..4c743d2e 100644
--- a/src/internal/pthread_impl.h
+++ b/src/internal/pthread_impl.h
@@ -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]