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| author | Ben Noordhuis <info@bnoordhuis.nl> | 2021-06-19 05:47:24 +0200 |
|---|---|---|
| committer | GitHub <noreply@github.com> | 2021-06-18 23:47:24 -0400 |
| commit | 963ecc82d0988f9bbaef07a6939d774dfd027b7c (patch) | |
| tree | 0d24c11fc187a5e415562b2ab960ceee7230d0be | |
| parent | 9918a1743816dc49d6c664e41641d78ffd4a0705 (diff) | |
| download | libuv-963ecc82d0988f9bbaef07a6939d774dfd027b7c.tar.gz libuv-963ecc82d0988f9bbaef07a6939d774dfd027b7c.zip | |
unix: implement cpu_relax() on ppc64
We also tell the compiler it is not allowed to reorder the PAUSE
instruction relative to other instructions. It is a mostly theoretical
issue, but better safe than sorry.
PR-URL: https://github.com/libuv/libuv/pull/2590
Reviewed-By: Richard Lau <riclau@uk.ibm.com>
Reviewed-By: Jameson Nash <vtjnash@gmail.com>
| -rw-r--r-- | src/unix/atomic-ops.h | 6 |
1 files changed, 4 insertions, 2 deletions
diff --git a/src/unix/atomic-ops.h b/src/unix/atomic-ops.h index 347d1936..c48d0584 100644 --- a/src/unix/atomic-ops.h +++ b/src/unix/atomic-ops.h @@ -52,9 +52,11 @@ UV_UNUSED(static int cmpxchgi(int* ptr, int oldval, int newval)) { UV_UNUSED(static void cpu_relax(void)) { #if defined(__i386__) || defined(__x86_64__) - __asm__ __volatile__ ("rep; nop"); /* a.k.a. PAUSE */ + __asm__ __volatile__ ("rep; nop" ::: "memory"); /* a.k.a. PAUSE */ #elif (defined(__arm__) && __ARM_ARCH >= 7) || defined(__aarch64__) - __asm__ volatile("yield"); + __asm__ __volatile__ ("yield" ::: "memory"); +#elif defined(__powerpc64__) || defined(__ppc64__) || defined(__PPC64__) + __asm__ __volatile__ ("or 1,1,1; or 2,2,2" ::: "memory"); #endif } |