diff options
Diffstat (limited to 'src/pkg/runtime/sys_windows_amd64.s')
| -rw-r--r-- | src/pkg/runtime/sys_windows_amd64.s | 32 |
1 files changed, 32 insertions, 0 deletions
diff --git a/src/pkg/runtime/sys_windows_amd64.s b/src/pkg/runtime/sys_windows_amd64.s index fe88f3b75..c20a268b1 100644 --- a/src/pkg/runtime/sys_windows_amd64.s +++ b/src/pkg/runtime/sys_windows_amd64.s @@ -346,3 +346,35 @@ TEXT runtime·install_exception_handler(SB),7,$0 TEXT runtime·remove_exception_handler(SB),7,$0 RET + +TEXT runtime·osyield(SB),7,$8 + // Tried NtYieldExecution but it doesn't yield hard enough. + // NtWaitForSingleObject being used here as Sleep(0). + // The CALL is safe because NtXxx is a system call wrapper: + // it puts the right system call number in AX, then does + // a SYSENTER and a RET. + MOVQ runtime·NtWaitForSingleObject(SB), AX + MOVQ $1, BX + NEGQ BX + MOVQ SP, R8 // ptime + MOVQ BX, (R8) + MOVQ $-1, CX // handle + MOVQ $0, DX // alertable + CALL AX + RET + +TEXT runtime·usleep(SB),7,$8 + // The CALL is safe because NtXxx is a system call wrapper: + // it puts the right system call number in AX, then does + // a SYSENTER and a RET. + MOVQ runtime·NtWaitForSingleObject(SB), AX + // Have 1us units; want negative 100ns units. + MOVL usec+0(FP), BX + IMULQ $10, BX + NEGQ BX + MOVQ SP, R8 // ptime + MOVQ BX, (R8) + MOVQ $-1, CX // handle + MOVQ $0, DX // alertable + CALL AX + RET |