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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
sysdeps/unix/sysv/linux/sparc/lowlevellock.h
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@ -25,12 +25,6 @@
#include <atomic.h>
#include <kernel-features.h>
#ifndef __sparc32_atomic_do_lock
/* Delay in spinlock loop. */
extern void __cpu_relax (void);
#define BUSY_WAIT_NOP __cpu_relax ()
#endif
#include <lowlevellock-futex.h>
static inline int