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runtime: use pselect6 for usleep on linux/amd64 and linux/arm

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Android O black-lists the select system call because its libc, Bionic,
does not use this system call. Replace our use of select with pselect6
(which is allowed) on the platforms that support targeting Android.
linux/arm64 already uses pselect6 because there is no select on arm64,
so only linux/amd64 and linux/arm need changing. pselect6 has been
available since Linux 2.6.16, which is before Go's minimum
requirement.

Fixes #20409.

Change-Id: Ic526b5b259a9e01d2f145a1f4d2e76e8c49ce809
Reviewed-on: https://go-review.googlesource.com/43641
Run-TryBot: Austin Clements <austin@google.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>
Reviewed-by: Ian Lance Taylor <iant@golang.org>
This commit is contained in:
Austin Clements 2017-05-18 16:56:48 -04:00
parent 366bb678aa
commit 4dcba023c6
2 changed files with 11 additions and 5 deletions
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9
src/runtime/sys_linux_amd64.s
View File

@ -82,15 +82,18 @@ TEXT runtime·usleep(SB),NOSPLIT,$16
MOVL $1000000, CX
DIVL CX
MOVQ AX, 0(SP)
MOVQ DX, 8(SP)
MOVL $1000, AX // usec to nsec
MULL DX
MOVQ AX, 8(SP)
// select(0, 0, 0, 0, &tv)
// pselect6(0, 0, 0, 0, &ts, 0)
MOVL $0, DI
MOVL $0, SI
MOVL $0, DX
MOVL $0, R10
MOVQ SP, R8
MOVL $23, AX
MOVL $0, R9
MOVL $270, AX
SYSCALL
RET

7
src/runtime/sys_linux_arm.s
View File

@ -36,7 +36,7 @@
#define SYS_gettid (SYS_BASE + 224)
#define SYS_tkill (SYS_BASE + 238)
#define SYS_sched_yield (SYS_BASE + 158)
#define SYS_select (SYS_BASE + 142) // newselect
#define SYS_pselect6 (SYS_BASE + 335)
#define SYS_ugetrlimit (SYS_BASE + 191)
#define SYS_sched_getaffinity (SYS_BASE + 242)
#define SYS_clock_gettime (SYS_BASE + 263)
@ -388,13 +388,16 @@ TEXT runtime·usleep(SB),NOSPLIT,$12
MOVW usec+0(FP), R0
CALL runtime·usplitR0(SB)
MOVW R0, 4(R13)
MOVW $1000, R0 // usec to nsec
MUL R0, R1
MOVW R1, 8(R13)
MOVW $0, R0
MOVW $0, R1
MOVW $0, R2
MOVW $0, R3
MOVW $4(R13), R4
MOVW $SYS_select, R7
MOVW $0, R5
MOVW $SYS_pselect6, R7
SWI $0
RET