| #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 |