diff options
| author | Ian Lance Taylor <iant@golang.org> | 2018-04-20 15:30:52 -0700 |
|---|---|---|
| committer | Ian Lance Taylor <iant@golang.org> | 2018-04-24 05:01:13 +0000 |
| commit | 665b9b3476ad0a6dc4e578e42e6c63012e23aaa0 (patch) | |
| tree | 4848606a8cb62e0a46e8f70983a2d32c75836ef3 /src/runtime/sys_linux_386.s | |
| parent | a3c75d9b313cc9f06969125ff28501c081dac3b8 (diff) | |
| download | go-665b9b3476ad0a6dc4e578e42e6c63012e23aaa0.tar.xz | |
runtime: change GNU/Linux usleep to use nanosleep
Ever since we added sleep to the runtime back in 2008, we've
implemented it on GNU/Linux with the select (or pselect or pselect6)
system call. But the Linux kernel has a nanosleep system call,
which should be a tiny bit more efficient since it doesn't have to
check to see whether there are any file descriptors. So use it.
Change-Id: Icc3430baca46b082a4d33f97c6c47e25fa91cb9a
Reviewed-on: https://go-review.googlesource.com/108538
Run-TryBot: Ian Lance Taylor <iant@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>
Diffstat (limited to 'src/runtime/sys_linux_386.s')
| -rw-r--r-- | src/runtime/sys_linux_386.s | 12 |
1 files changed, 4 insertions, 8 deletions
diff --git a/src/runtime/sys_linux_386.s b/src/runtime/sys_linux_386.s index 721551faec..8d5a4ff977 100644 --- a/src/runtime/sys_linux_386.s +++ b/src/runtime/sys_linux_386.s @@ -39,6 +39,7 @@ #define SYS_setittimer 104 #define SYS_clone 120 #define SYS_sched_yield 158 +#define SYS_nanosleep 162 #define SYS_rt_sigreturn 173 #define SYS_rt_sigaction 174 #define SYS_rt_sigprocmask 175 @@ -56,7 +57,6 @@ #define SYS_epoll_ctl 255 #define SYS_epoll_wait 256 #define SYS_clock_gettime 265 -#define SYS_pselect6 308 #define SYS_epoll_create1 329 TEXT runtime·exit(SB),NOSPLIT,$0 @@ -141,14 +141,10 @@ TEXT runtime·usleep(SB),NOSPLIT,$8 MULL DX MOVL AX, 4(SP) - // pselect6(0, 0, 0, 0, &ts, 0) - MOVL $SYS_pselect6, AX - MOVL $0, BX + // nanosleep(&ts, 0) + MOVL $SYS_nanosleep, AX + LEAL 0(SP), BX MOVL $0, CX - MOVL $0, DX - MOVL $0, SI - LEAL 0(SP), DI - MOVL $0, BP INVOKE_SYSCALL RET |