1 /* go-cgo.c -- SWIG support routines for libgo. 2 3 Copyright 2011 The Go Authors. All rights reserved. 4 Use of this source code is governed by a BSD-style 5 license that can be found in the LICENSE file. */ 6 7 #include "runtime.h" 8 9 /* Used for _cgo_wait_runtime_init_done. This is based on code in 10 runtime/cgo/gcc_libinit.c in the master library. */ 11 12 static pthread_cond_t runtime_init_cond = PTHREAD_COND_INITIALIZER; 13 static pthread_mutex_t runtime_init_mu = PTHREAD_MUTEX_INITIALIZER; 14 static _Bool runtime_init_done; 15 16 /* This is called by exported cgo functions to ensure that the runtime 17 has been initialized before we enter the function. This is needed 18 when building with -buildmode=c-archive or similar. */ 19 20 void _cgo_wait_runtime_init_done(void)21_cgo_wait_runtime_init_done (void) 22 { 23 int err; 24 25 if (__atomic_load_n (&runtime_init_done, __ATOMIC_ACQUIRE)) 26 return; 27 28 err = pthread_mutex_lock (&runtime_init_mu); 29 if (err != 0) 30 abort (); 31 while (!__atomic_load_n (&runtime_init_done, __ATOMIC_ACQUIRE)) 32 { 33 err = pthread_cond_wait (&runtime_init_cond, &runtime_init_mu); 34 if (err != 0) 35 abort (); 36 } 37 err = pthread_mutex_unlock (&runtime_init_mu); 38 if (err != 0) 39 abort (); 40 } 41 42 /* This is called by runtime_main after the Go runtime is 43 initialized. */ 44 45 void _cgo_notify_runtime_init_done(void)46_cgo_notify_runtime_init_done (void) 47 { 48 int err; 49 50 err = pthread_mutex_lock (&runtime_init_mu); 51 if (err != 0) 52 abort (); 53 __atomic_store_n (&runtime_init_done, 1, __ATOMIC_RELEASE); 54 err = pthread_cond_broadcast (&runtime_init_cond); 55 if (err != 0) 56 abort (); 57 err = pthread_mutex_unlock (&runtime_init_mu); 58 if (err != 0) 59 abort (); 60 } 61 62 // runtime_iscgo is set to true if some cgo code is linked in. 63 // This is done by a constructor in the cgo generated code. 64 _Bool runtime_iscgo; 65