1 // Copyright 2014 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 <signal.h> 7 #include <stdio.h> 8 #include <sys/limits.h> 9 #include "libcgo.h" 10 11 #define magic1 (0x23581321U) 12 13 // PTHREAD_KEYS_MAX has been added to sys/limits.h at head in bionic: 14 // https://android.googlesource.com/platform/bionic/+/master/libc/include/sys/limits.h 15 // TODO(crawshaw): remove this definition when NDK r10d is required. 16 #ifndef PTHREAD_KEYS_MAX 17 #define PTHREAD_KEYS_MAX 128 18 #endif 19 20 // inittls allocates a thread-local storage slot for g. 21 // 22 // It finds the first available slot using pthread_key_create and uses 23 // it as the offset value for runtime.tlsg. 24 static void 25 inittls(void **tlsg, void **tlsbase) 26 { 27 pthread_key_t k; 28 int i, err; 29 30 err = pthread_key_create(&k, nil); 31 if(err != 0) { 32 fatalf("pthread_key_create failed: %d", err); 33 } 34 pthread_setspecific(k, (void*)magic1); 35 for (i=0; i<PTHREAD_KEYS_MAX; i++) { 36 if (*(tlsbase+i) == (void*)magic1) { 37 *tlsg = (void*)(i*sizeof(void *)); 38 pthread_setspecific(k, 0); 39 return; 40 } 41 } 42 fatalf("could not find pthread key"); 43 } 44 45 void (*x_cgo_inittls)(void **tlsg, void **tlsbase) = inittls; 46
