1 // Copyright 2016 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 static void (*setg_gcc)(void*); 15 16 void 17 x_cgo_init(G *g, void (*setg)(void*), void **tlsbase) 18 { 19 pthread_attr_t attr; 20 size_t size; 21 22 setg_gcc = setg; 23 pthread_attr_init(&attr); 24 pthread_attr_getstacksize(&attr, &size); 25 g->stacklo = (uintptr)&attr - size + 4096; 26 pthread_attr_destroy(&attr); 27 } 28 29 void 30 _cgo_sys_thread_start(ThreadStart *ts) 31 { 32 pthread_attr_t attr; 33 sigset_t ign, oset; 34 pthread_t p; 35 size_t size; 36 int err; 37 38 sigfillset(&ign); 39 pthread_sigmask(SIG_SETMASK, &ign, &oset); 40 41 pthread_attr_init(&attr); 42 pthread_attr_getstacksize(&attr, &size); 43 // Leave stacklo=0 and set stackhi=size; mstart will do the rest. 44 ts->g->stackhi = size; 45 err = _cgo_try_pthread_create(&p, &attr, threadentry, ts); 46 47 pthread_sigmask(SIG_SETMASK, &oset, nil); 48 49 if (err != 0) { 50 fatalf("pthread_create failed: %s", strerror(err)); 51 } 52 } 53 54 extern void crosscall_s390x(void (*fn)(void), void *g); 55 56 static void* 57 threadentry(void *v) 58 { 59 ThreadStart ts; 60 61 ts = *(ThreadStart*)v; 62 free(v); 63 64 // Save g for this thread in C TLS 65 setg_gcc((void*)ts.g); 66 67 crosscall_s390x(ts.fn, (void*)ts.g); 68 return nil; 69 } 70
