mirror of
https://github.com/golang/go
synced 2024-10-04 16:11:21 -06:00
8a3c587dc1
- do not lose profiling signals when we have no mcache (possible for syscalls/cgo) - do not lose any profiling signals on windows - fix profiling of cgo programs on windows (they had no m->thread setup) - properly setup tls in cgo programs on windows - check _beginthread return value Fixes #6417. Fixes #6986. R=alex.brainman, rsc CC=golang-codereviews https://golang.org/cl/44820047
63 lines
1.3 KiB
C
63 lines
1.3 KiB
C
// Copyright 2009 The Go Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style
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// license that can be found in the LICENSE file.
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#define WIN64_LEAN_AND_MEAN
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#include <windows.h>
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#include <process.h>
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#include <stdlib.h>
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#include <stdio.h>
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#include "libcgo.h"
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static void threadentry(void*);
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/* 2MB is default stack size for 64-bit Windows.
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Allocation granularity on Windows is typically 64 KB.
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The constant is also hardcoded in cmd/ld/pe.c (keep synchronized). */
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#define STACKSIZE (2*1024*1024)
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void
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x_cgo_init(G *g)
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{
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int tmp;
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g->stackguard = (uintptr)&tmp - STACKSIZE + 8*1024;
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}
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void
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_cgo_sys_thread_start(ThreadStart *ts)
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{
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uintptr_t thandle;
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thandle = _beginthread(threadentry, 0, ts);
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if(thandle == -1) {
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fprintf(stderr, "runtime: failed to create new OS thread (%d)\n", errno);
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abort();
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}
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}
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static void
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threadentry(void *v)
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{
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ThreadStart ts;
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ts = *(ThreadStart*)v;
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free(v);
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ts.g->stackbase = (uintptr)&ts;
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ts.g->stackguard = (uintptr)&ts - STACKSIZE + 8*1024;
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/*
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* Set specific keys in thread local storage.
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*/
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asm volatile (
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"movq %0, %%gs:0x28\n" // MOVL tls0, 0x28(GS)
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"movq %%gs:0x28, %%rax\n" // MOVQ 0x28(GS), tmp
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"movq %1, 0(%%rax)\n" // MOVQ g, 0(GS)
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"movq %2, 8(%%rax)\n" // MOVQ m, 8(GS)
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:: "r"(ts.tls), "r"(ts.g), "r"(ts.m) : "%rax"
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);
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crosscall_amd64(ts.fn);
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}
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