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29 lines
717 B
Diff
29 lines
717 B
Diff
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--- glibc-2.23/nptl/pthread_mutex_lock.c.org 2016-03-03 22:33:24.230342596 -0500
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+++ glibc-2.23/nptl/pthread_mutex_lock.c 2016-03-03 22:43:18.285915880 -0500
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@@ -75,9 +75,22 @@
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if (__glibc_likely (type == PTHREAD_MUTEX_TIMED_NP))
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{
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FORCE_ELISION (mutex, goto elision);
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- simple:
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- /* Normal mutex. */
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- LLL_MUTEX_LOCK (mutex);
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+ if (LLL_MUTEX_TRYLOCK (mutex) != 0)
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+ {
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+ int cnt = 0;
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+ do
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+ {
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+ if (cnt++ >= 256 || !__is_smp)
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+ {
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+ /* Normal mutex. */
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+simple:
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+ LLL_MUTEX_LOCK (mutex);
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+ break;
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+ }
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+ atomic_spin_nop ();
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+ }
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+ while (LLL_MUTEX_TRYLOCK (mutex) != 0);
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+ }
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assert (mutex->__data.__owner == 0);
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}
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#ifdef HAVE_ELISION
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