| // 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; |
