1 // Copyright 2015 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 #include "libcgo_unix.h" 10 11 static void *threadentry(void*); 12 13 void (*x_cgo_inittls)(void **tlsg, void **tlsbase); 14 void (*setg_gcc)(void*); 15 16 void 17 _cgo_sys_thread_start(ThreadStart *ts) 18 { 19 pthread_attr_t attr; 20 sigset_t ign, oset; 21 pthread_t p; 22 size_t size; 23 int err; 24 25 sigfillset(&ign); 26 pthread_sigmask(SIG_SETMASK, &ign, &oset); 27 28 // Not sure why the memset is necessary here, 29 // but without it, we get a bogus stack size 30 // out of pthread_attr_getstacksize. C'est la Linux. 31 memset(&attr, 0, sizeof attr); 32 pthread_attr_init(&attr); 33 size = 0; 34 pthread_attr_getstacksize(&attr, &size); 35 // Leave stacklo=0 and set stackhi=size; mstart will do the rest. 36 ts->g->stackhi = size; 37 err = _cgo_try_pthread_create(&p, &attr, threadentry, ts); 38 39 pthread_sigmask(SIG_SETMASK, &oset, nil); 40 41 if (err != 0) { 42 fatalf("pthread_create failed: %s", strerror(err)); 43 } 44 } 45 46 extern void crosscall1(void (*fn)(void), void (*setg_gcc)(void*), void *g); 47 static void* 48 threadentry(void *v) 49 { 50 ThreadStart ts; 51 52 ts = *(ThreadStart*)v; 53 free(v); 54 55 crosscall1(ts.fn, setg_gcc, (void*)ts.g); 56 return nil; 57 } 58 59 void 60 x_cgo_init(G *g, void (*setg)(void*), void **tlsg, void **tlsbase) 61 { 62 pthread_attr_t attr; 63 size_t size; 64 65 setg_gcc = setg; 66 pthread_attr_init(&attr); 67 pthread_attr_getstacksize(&attr, &size); 68 g->stacklo = (uintptr)&attr - size + 4096; 69 pthread_attr_destroy(&attr); 70 71 if (x_cgo_inittls) { 72 x_cgo_inittls(tlsg, tlsbase); 73 } 74 } 75
