diff options
Diffstat (limited to 'src/runtime/cgo/gcc_android_arm.c')
-rw-r--r-- | src/runtime/cgo/gcc_android_arm.c | 43 |
1 files changed, 43 insertions, 0 deletions
diff --git a/src/runtime/cgo/gcc_android_arm.c b/src/runtime/cgo/gcc_android_arm.c new file mode 100644 index 000000000..07f7e72e3 --- /dev/null +++ b/src/runtime/cgo/gcc_android_arm.c @@ -0,0 +1,43 @@ +// Copyright 2014 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 (0x23581321U) + +// PTHREAD_KEYS_MAX has been added to sys/limits.h at head in bionic: +// https://android.googlesource.com/platform/bionic/+/master/libc/include/sys/limits.h +// TODO(crawshaw): remove this definition when a new NDK is released. +#define PTHREAD_KEYS_MAX 128 + +// 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; |