// 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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#include <string.h> /* for strerror */
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#include <pthread.h>
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#include <signal.h>
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#include "libcgo.h"
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#include "libcgo_unix.h"
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static void* threadentry(void*);
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void
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x_cgo_init(G *g)
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{
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pthread_attr_t attr;
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size_t size;
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pthread_attr_init(&attr);
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pthread_attr_getstacksize(&attr, &size);
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g->stacklo = (uintptr)&attr - size + 4096;
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pthread_attr_destroy(&attr);
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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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pthread_attr_t attr;
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sigset_t ign, oset;
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pthread_t p;
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size_t size;
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int err;
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sigfillset(&ign);
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pthread_sigmask(SIG_SETMASK, &ign, &oset);
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pthread_attr_init(&attr);
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pthread_attr_getstacksize(&attr, &size);
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// Leave stacklo=0 and set stackhi=size; mstart will do the rest.
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ts->g->stackhi = size;
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err = _cgo_try_pthread_create(&p, &attr, threadentry, ts);
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pthread_sigmask(SIG_SETMASK, &oset, nil);
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if (err != 0) {
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fprintf(stderr, "runtime/cgo: pthread_create failed: %s\n", strerror(err));
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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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// Move the g pointer into the slot reserved in thread local storage.
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// Constant must match the one in cmd/link/internal/ld/sym.go.
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asm volatile("movl %0, %%gs:0x18" :: "r"(ts.g));
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crosscall_386(ts.fn);
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return nil;
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}
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