| // Copyright 2019 The gVisor Authors. |
| // |
| // 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 |
| MOVD waitingG+8(FP), R0 |
| MOVD $preparingG, R1 |
| MOVD G+0(FP), R2 |
| |
| // Store the G in waitingG if it's still preparingG. If it's anything |
| // else it means a waker has aborted the sleep. |
| again: |
| LDAXR (R0), R3 |
| CMP R1, R3 |
| BNE ok |
| STLXR R2, (R0), R3 |
| CBNZ R3, again |
| ok: |
| CSET EQ, R0 |
| MOVB R0, ret+16(FP) |
| RET |
