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commit b023e4ca99f5e81f90d87d23cd267ef2abd2388c
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Author: Andi Kleen <ak@linux.intel.com>
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Date: Sat Dec 22 00:58:34 2012 -0800
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Add new internal mutex type flags for elision.
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Add Enable/disable flags used internally
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Extend the mutex initializers to have the fields needed for
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elision. The layout stays the same, and this is not visible
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to programs.
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These changes are not exposed outside pthread
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Index: glibc-2.17-c758a686/nptl/pthreadP.h
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===================================================================
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--- glibc-2.17-c758a686.orig/nptl/pthreadP.h
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+++ glibc-2.17-c758a686/nptl/pthreadP.h
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@@ -61,6 +61,10 @@
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enum
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{
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PTHREAD_MUTEX_KIND_MASK_NP = 3,
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+
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+ PTHREAD_MUTEX_ELISION_NP = 256,
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+ PTHREAD_MUTEX_NO_ELISION_NP = 512,
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+
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PTHREAD_MUTEX_ROBUST_NORMAL_NP = 16,
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PTHREAD_MUTEX_ROBUST_RECURSIVE_NP
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= PTHREAD_MUTEX_ROBUST_NORMAL_NP | PTHREAD_MUTEX_RECURSIVE_NP,
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@@ -93,12 +97,21 @@ enum
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PTHREAD_MUTEX_PP_ERRORCHECK_NP
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= PTHREAD_MUTEX_PRIO_PROTECT_NP | PTHREAD_MUTEX_ERRORCHECK_NP,
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PTHREAD_MUTEX_PP_ADAPTIVE_NP
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- = PTHREAD_MUTEX_PRIO_PROTECT_NP | PTHREAD_MUTEX_ADAPTIVE_NP
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+ = PTHREAD_MUTEX_PRIO_PROTECT_NP | PTHREAD_MUTEX_ADAPTIVE_NP,
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+ PTHREAD_MUTEX_ELISION_FLAGS_NP
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+ = PTHREAD_MUTEX_ELISION_NP | PTHREAD_MUTEX_NO_ELISION_NP,
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+
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+ PTHREAD_MUTEX_TIMED_ELISION_NP =
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+ PTHREAD_MUTEX_TIMED_NP | PTHREAD_MUTEX_ELISION_NP,
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+ PTHREAD_MUTEX_TIMED_NO_ELISION_NP =
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+ PTHREAD_MUTEX_TIMED_NP | PTHREAD_MUTEX_NO_ELISION_NP,
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};
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#define PTHREAD_MUTEX_PSHARED_BIT 128
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#define PTHREAD_MUTEX_TYPE(m) \
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((m)->__data.__kind & 127)
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+#define PTHREAD_MUTEX_TYPE_ELISION(m) \
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+ ((m)->__data.__kind & (127|PTHREAD_MUTEX_ELISION_FLAGS_NP))
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#if LLL_PRIVATE == 0 && LLL_SHARED == 128
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# define PTHREAD_MUTEX_PSHARED(m) \
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Index: glibc-2.17-c758a686/nptl/sysdeps/pthread/pthread.h
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===================================================================
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--- glibc-2.17-c758a686.orig/nptl/sysdeps/pthread/pthread.h
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+++ glibc-2.17-c758a686/nptl/sysdeps/pthread/pthread.h
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@@ -83,27 +83,39 @@ enum
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/* Mutex initializers. */
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+#if __PTHREAD_MUTEX_HAVE_ELISION == 1 /* 64bit layout. */
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+#define __PTHREAD_SPINS 0, 0
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+#elif __PTHREAD_MUTEX_HAVE_ELISION == 2 /* 32bit layout. */
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+#define __PTHREAD_SPINS { 0, 0 }
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+#else
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+#define __PTHREAD_SPINS 0
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+#endif
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+
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#ifdef __PTHREAD_MUTEX_HAVE_PREV
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# define PTHREAD_MUTEX_INITIALIZER \
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- { { 0, 0, 0, 0, 0, 0, { 0, 0 } } }
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+ { { 0, 0, 0, 0, 0, __PTHREAD_SPINS, { 0, 0 } } }
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# ifdef __USE_GNU
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# define PTHREAD_RECURSIVE_MUTEX_INITIALIZER_NP \
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- { { 0, 0, 0, 0, PTHREAD_MUTEX_RECURSIVE_NP, 0, { 0, 0 } } }
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+ { { 0, 0, 0, 0, PTHREAD_MUTEX_RECURSIVE_NP, __PTHREAD_SPINS, { 0, 0 } } }
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# define PTHREAD_ERRORCHECK_MUTEX_INITIALIZER_NP \
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- { { 0, 0, 0, 0, PTHREAD_MUTEX_ERRORCHECK_NP, 0, { 0, 0 } } }
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+ { { 0, 0, 0, 0, PTHREAD_MUTEX_ERRORCHECK_NP, __PTHREAD_SPINS, { 0, 0 } } }
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# define PTHREAD_ADAPTIVE_MUTEX_INITIALIZER_NP \
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- { { 0, 0, 0, 0, PTHREAD_MUTEX_ADAPTIVE_NP, 0, { 0, 0 } } }
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+ { { 0, 0, 0, 0, PTHREAD_MUTEX_ADAPTIVE_NP, __PTHREAD_SPINS, { 0, 0 } } }
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+# define PTHREAD_ADAPTIVE_MUTEX_INITIALIZER_NP \
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+ { { 0, 0, 0, 0, PTHREAD_MUTEX_ADAPTIVE_NP, __PTHREAD_SPINS, { 0, 0 } } }
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+
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# endif
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#else
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# define PTHREAD_MUTEX_INITIALIZER \
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- { { 0, 0, 0, 0, 0, { 0 } } }
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+ { { 0, 0, 0, 0, 0, { __PTHREAD_SPINS } } }
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![](https://seccdn.libravatar.org/avatar/eca4d0658e293ac828929c05684948cb411ba891fa2ad2130aafa91b664e89ad?s=16&d=retro) |
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# ifdef __USE_GNU
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![](https://seccdn.libravatar.org/avatar/eca4d0658e293ac828929c05684948cb411ba891fa2ad2130aafa91b664e89ad?s=16&d=retro) |
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# define PTHREAD_RECURSIVE_MUTEX_INITIALIZER_NP \
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![](https://seccdn.libravatar.org/avatar/eca4d0658e293ac828929c05684948cb411ba891fa2ad2130aafa91b664e89ad?s=16&d=retro) |
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- { { 0, 0, 0, PTHREAD_MUTEX_RECURSIVE_NP, 0, { 0 } } }
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![](https://seccdn.libravatar.org/avatar/eca4d0658e293ac828929c05684948cb411ba891fa2ad2130aafa91b664e89ad?s=16&d=retro) |
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+ { { 0, 0, 0, PTHREAD_MUTEX_RECURSIVE_NP, 0, { __PTHREAD_SPINS } } }
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![](https://seccdn.libravatar.org/avatar/eca4d0658e293ac828929c05684948cb411ba891fa2ad2130aafa91b664e89ad?s=16&d=retro) |
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# define PTHREAD_ERRORCHECK_MUTEX_INITIALIZER_NP \
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![](https://seccdn.libravatar.org/avatar/eca4d0658e293ac828929c05684948cb411ba891fa2ad2130aafa91b664e89ad?s=16&d=retro) |
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- { { 0, 0, 0, PTHREAD_MUTEX_ERRORCHECK_NP, 0, { 0 } } }
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![](https://seccdn.libravatar.org/avatar/eca4d0658e293ac828929c05684948cb411ba891fa2ad2130aafa91b664e89ad?s=16&d=retro) |
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+ { { 0, 0, 0, PTHREAD_MUTEX_ERRORCHECK_NP, 0, { __PTHREAD_SPINS } } }
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![](https://seccdn.libravatar.org/avatar/eca4d0658e293ac828929c05684948cb411ba891fa2ad2130aafa91b664e89ad?s=16&d=retro) |
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# define PTHREAD_ADAPTIVE_MUTEX_INITIALIZER_NP \
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![](https://seccdn.libravatar.org/avatar/eca4d0658e293ac828929c05684948cb411ba891fa2ad2130aafa91b664e89ad?s=16&d=retro) |
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- { { 0, 0, 0, PTHREAD_MUTEX_ADAPTIVE_NP, 0, { 0 } } }
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![](https://seccdn.libravatar.org/avatar/eca4d0658e293ac828929c05684948cb411ba891fa2ad2130aafa91b664e89ad?s=16&d=retro) |
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+ { { 0, 0, 0, PTHREAD_MUTEX_ADAPTIVE_NP, 0, { __PTHREAD_SPINS } } }
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![](https://seccdn.libravatar.org/avatar/eca4d0658e293ac828929c05684948cb411ba891fa2ad2130aafa91b664e89ad?s=16&d=retro) |
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+
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![](https://seccdn.libravatar.org/avatar/eca4d0658e293ac828929c05684948cb411ba891fa2ad2130aafa91b664e89ad?s=16&d=retro) |
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# endif
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#endif
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![](https://seccdn.libravatar.org/avatar/eca4d0658e293ac828929c05684948cb411ba891fa2ad2130aafa91b664e89ad?s=16&d=retro) |
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