diff options
Diffstat (limited to 'pkg/tcpip/link/rawfile/blockingpoll_amd64.s')
| -rw-r--r-- | pkg/tcpip/link/rawfile/blockingpoll_amd64.s | 26 |
1 files changed, 26 insertions, 0 deletions
diff --git a/pkg/tcpip/link/rawfile/blockingpoll_amd64.s b/pkg/tcpip/link/rawfile/blockingpoll_amd64.s new file mode 100644 index 000000000..88206fc87 --- /dev/null +++ b/pkg/tcpip/link/rawfile/blockingpoll_amd64.s @@ -0,0 +1,26 @@ +#include "textflag.h" + +// blockingPoll makes the poll() syscall while calling the version of +// entersyscall that relinquishes the P so that other Gs can run. This is meant +// to be called in cases when the syscall is expected to block. +// +// func blockingPoll(fds unsafe.Pointer, nfds int, timeout int64) (n int, err syscall.Errno) +TEXT ·blockingPoll(SB),NOSPLIT,$0-40 + CALL runtime·entersyscallblock(SB) + MOVQ fds+0(FP), DI + MOVQ nfds+8(FP), SI + MOVQ timeout+16(FP), DX + MOVQ $0x7, AX // SYS_POLL + SYSCALL + CMPQ AX, $0xfffffffffffff001 + JLS ok + MOVQ $-1, n+24(FP) + NEGQ AX + MOVQ AX, err+32(FP) + CALL runtime·exitsyscall(SB) + RET +ok: + MOVQ AX, n+24(FP) + MOVQ $0, err+32(FP) + CALL runtime·exitsyscall(SB) + RET |