| // Copyright 2018 Google Inc. |
| // |
| // 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" |
| |
| #define preparingG 1 |
| |
| // See commit_noasm.go for a description of commitSleep. |
| // |
| // func commitSleep(g uintptr, waitingG *uintptr) bool |
| TEXT ·commitSleep(SB),NOSPLIT,$0-24 |
| MOVQ waitingG+8(FP), CX |
| MOVQ g+0(FP), DX |
| |
| // Store the G in waitingG if it's still preparingG. If it's anything |
| // else it means a waker has aborted the sleep. |
| MOVQ $preparingG, AX |
| LOCK |
| CMPXCHGQ DX, 0(CX) |
| |
| SETEQ AX |
| MOVB AX, ret+16(FP) |
| |
| RET |
