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Clean up BUSY_WAIT_NOP and atomic_delay.

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This patch combines BUSY_WAIT_NOP and atomic_delay into a new
atomic_spin_nop function and adjusts all clients.  The new function is
put into atomic.h because what is best done in a spin loop is
architecture-specific, and atomics must be used for spinning.  The
function name is meant to tell users that this has no effect on
synchronization semantics but is a performance aid for spinning.
This commit is contained in:
Torvald Riegel
2015-06-23 15:22:25 +02:00
parent e02920bc02
commit 4eb984d3ab
14 changed files with 42 additions and 33 deletions
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6
nptl/pthread_mutex_lock.c
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@ -23,6 +23,7 @@
#include <sys/param.h>
#include <not-cancel.h>
#include "pthreadP.h"
#include <atomic.h>
#include <lowlevellock.h>
#include <stap-probe.h>
@ -135,10 +136,7 @@ __pthread_mutex_lock (mutex)
LLL_MUTEX_LOCK (mutex);
break;
}
#ifdef BUSY_WAIT_NOP
BUSY_WAIT_NOP;
#endif
atomic_spin_nop ();
}
while (LLL_MUTEX_TRYLOCK (mutex) != 0);