1 // Copyright 2010 The Go Authors. All rights reserved. 2 // Use of this source code is governed by a BSD-style 3 // license that can be found in the LICENSE file. 4 5 #include <pthread.h> 6 #include <string.h> 7 #include <signal.h> 8 #include "libcgo.h" 9 10 static void *threadentry(void*); 11 12 void (*x_cgo_inittls)(void **tlsg, void **tlsbase); 13 void (*setg_gcc)(void*); 14 15 void 16 _cgo_sys_thread_start(ThreadStart *ts) 17 { 18 pthread_attr_t attr; 19 sigset_t ign, oset; 20 pthread_t p; 21 size_t size; 22 int err; 23 24 sigfillset(&ign); 25 pthread_sigmask(SIG_SETMASK, &ign, &oset); 26 27 // Not sure why the memset is necessary here, 28 // but without it, we get a bogus stack size 29 // out of pthread_attr_getstacksize. C'est la Linux. 30 memset(&attr, 0, sizeof attr); 31 pthread_attr_init(&attr); 32 size = 0; 33 pthread_attr_getstacksize(&attr, &size); 34 // Leave stacklo=0 and set stackhi=size; mstack will do the rest. 35 ts->g->stackhi = size; 36 err = pthread_create(&p, &attr, threadentry, ts); 37 38 pthread_sigmask(SIG_SETMASK, &oset, nil); 39 40 if (err != 0) { 41 fatalf("pthread_create failed: %s", strerror(err)); 42 } 43 } 44 45 extern void crosscall_arm1(void (*fn)(void), void (*setg_gcc)(void*), void *g); 46 static void* 47 threadentry(void *v) 48 { 49 ThreadStart ts; 50 51 ts = *(ThreadStart*)v; 52 free(v); 53 54 crosscall_arm1(ts.fn, setg_gcc, (void*)ts.g); 55 return nil; 56 } 57 58 void 59 x_cgo_init(G *g, void (*setg)(void*), void **tlsg, void **tlsbase) 60 { 61 pthread_attr_t attr; 62 size_t size; 63 64 setg_gcc = setg; 65 pthread_attr_init(&attr); 66 pthread_attr_getstacksize(&attr, &size); 67 g->stacklo = (uintptr)&attr - size + 4096; 68 pthread_attr_destroy(&attr); 69 70 if (x_cgo_inittls) { 71 x_cgo_inittls(tlsg, tlsbase); 72 } 73 } 74
