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// Copyright 2018 Google LLC
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
#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 *pollEvent, nfds int, timeout int64) (n int, err syscall.Errno)
TEXT ·blockingPoll(SB),NOSPLIT,$0-40
CALL ·callEntersyscallblock(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 ·callExitsyscall(SB)
RET
ok:
MOVQ AX, n+24(FP)
MOVQ $0, err+32(FP)
CALL ·callExitsyscall(SB)
RET
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