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| author | Torvald Riegel <triegel@redhat.com> | 2015-06-23 15:22:25 +0200 |
|---|---|---|
| committer | Torvald Riegel <triegel@redhat.com> | 2015-06-30 15:57:15 +0200 |
| commit | 4eb984d3ab5641ce7992204756ac15a61f5f7181 (patch) | |
| tree | 12603bae9d2582033a3186174d1379121e1ea642 /sysdeps/sparc | |
| parent | e02920bc029019443326eecaa7b267b78ff2892e (diff) | |
| download | glibc-4eb984d3ab5641ce7992204756ac15a61f5f7181.tar.gz | |
Clean up BUSY_WAIT_NOP and atomic_delay.
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.
Diffstat (limited to 'sysdeps/sparc')
| -rw-r--r-- | sysdeps/sparc/sparc32/sparcv9/bits/atomic.h | 3 | ||||
| -rw-r--r-- | sysdeps/sparc/sparc64/bits/atomic.h | 3 |
2 files changed, 6 insertions, 0 deletions
diff --git a/sysdeps/sparc/sparc32/sparcv9/bits/atomic.h b/sysdeps/sparc/sparc32/sparcv9/bits/atomic.h index 317be62ccb..2122afbb09 100644 --- a/sysdeps/sparc/sparc32/sparcv9/bits/atomic.h +++ b/sysdeps/sparc/sparc32/sparcv9/bits/atomic.h @@ -100,3 +100,6 @@ typedef uintmax_t uatomic_max_t; __asm __volatile ("membar #LoadLoad | #LoadStore" : : : "memory") #define atomic_write_barrier() \ __asm __volatile ("membar #LoadStore | #StoreStore" : : : "memory") + +extern void __cpu_relax (void); +#define atomic_spin_nop () __cpu_relax () diff --git a/sysdeps/sparc/sparc64/bits/atomic.h b/sysdeps/sparc/sparc64/bits/atomic.h index 35804a8e14..48b7fd6216 100644 --- a/sysdeps/sparc/sparc64/bits/atomic.h +++ b/sysdeps/sparc/sparc64/bits/atomic.h @@ -121,3 +121,6 @@ typedef uintmax_t uatomic_max_t; __asm __volatile ("membar #LoadLoad | #LoadStore" : : : "memory") #define atomic_write_barrier() \ __asm __volatile ("membar #LoadStore | #StoreStore" : : : "memory") + +extern void __cpu_relax (void); +#define atomic_spin_nop () __cpu_relax () |