| // Copyright 2015 The Go Authors. All rights reserved. | |
| // Use of this source code is governed by a BSD-style | |
| // license that can be found in the LICENSE file. | |
| #include <pthread.h> | |
| #include <signal.h> | |
| #include <stdio.h> | |
| #include <sys/limits.h> | |
| #include "libcgo.h" | |
| #define magic1 (0x23581321345589ULL) | |
| // inittls allocates a thread-local storage slot for g. | |
| // | |
| // It finds the first available slot using pthread_key_create and uses | |
| // it as the offset value for runtime.tlsg. | |
| static void | |
| inittls(void **tlsg, void **tlsbase) | |
| { | |
| pthread_key_t k; | |
| int i, err; | |
| err = pthread_key_create(&k, nil); | |
| if(err != 0) { | |
| fatalf("pthread_key_create failed: %d", err); | |
| } | |
| pthread_setspecific(k, (void*)magic1); | |
| for (i=0; i<PTHREAD_KEYS_MAX; i++) { | |
| if (*(tlsbase+i) == (void*)magic1) { | |
| *tlsg = (void*)(i*sizeof(void *)); | |
| pthread_setspecific(k, 0); | |
| return; | |
| } | |
| } | |
| fatalf("could not find pthread key"); | |
| } | |
| void (*x_cgo_inittls)(void **tlsg, void **tlsbase) = inittls; |