github.com/aloncn/graphics-go@v0.0.1/src/runtime/cgo/gcc_android_arm64.c (about)

     1  // Copyright 2015 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  // +build cgo
     6  
     7  #include <pthread.h>
     8  #include <signal.h>
     9  #include <stdio.h>
    10  #include <sys/limits.h>
    11  #include "libcgo.h"
    12  
    13  #define magic1 (0x23581321345589ULL)
    14  
    15  // inittls allocates a thread-local storage slot for g.
    16  //
    17  // It finds the first available slot using pthread_key_create and uses
    18  // it as the offset value for runtime.tlsg.
    19  static void
    20  inittls(void **tlsg, void **tlsbase)
    21  {
    22  	pthread_key_t k;
    23  	int i, err;
    24  
    25  	err = pthread_key_create(&k, nil);
    26  	if(err != 0) {
    27  		fatalf("pthread_key_create failed: %d", err);
    28  	}
    29  	pthread_setspecific(k, (void*)magic1);
    30  	for (i=0; i<PTHREAD_KEYS_MAX; i++) {
    31  		if (*(tlsbase+i) == (void*)magic1) {
    32  			*tlsg = (void*)(i*sizeof(void *));
    33  			pthread_setspecific(k, 0);
    34  			return;
    35  		}
    36  	}
    37  	fatalf("could not find pthread key");
    38  }
    39  
    40  void (*x_cgo_inittls)(void **tlsg, void **tlsbase) = inittls;