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Text file src/runtime/cgo/gcc_android_arm64.c

Documentation: runtime/cgo

     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	#include <pthread.h>
     6	#include <signal.h>
     7	#include <stdio.h>
     8	#include <sys/limits.h>
     9	#include "libcgo.h"
    10	
    11	#define magic1 (0x23581321345589ULL)
    12	
    13	// inittls allocates a thread-local storage slot for g.
    14	//
    15	// It finds the first available slot using pthread_key_create and uses
    16	// it as the offset value for runtime.tlsg.
    17	static void
    18	inittls(void **tlsg, void **tlsbase)
    19	{
    20		pthread_key_t k;
    21		int i, err;
    22	
    23		err = pthread_key_create(&k, nil);
    24		if(err != 0) {
    25			fatalf("pthread_key_create failed: %d", err);
    26		}
    27		pthread_setspecific(k, (void*)magic1);
    28		// If thread local slots are laid out as we expect, our magic word will
    29		// be located at some low offset from tlsbase. However, just in case something went
    30		// wrong, the search is limited to sensible offsets. PTHREAD_KEYS_MAX was the
    31		// original limit, but issue 19472 made a higher limit necessary.
    32		for (i=0; i<384; i++) {
    33			if (*(tlsbase+i) == (void*)magic1) {
    34				*tlsg = (void*)(i*sizeof(void *));
    35				pthread_setspecific(k, 0);
    36				return;
    37			}
    38		}
    39		fatalf("could not find pthread key");
    40	}
    41	
    42	void (*x_cgo_inittls)(void **tlsg, void **tlsbase) = inittls;

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