93 lines
1.8 KiB
C
93 lines
1.8 KiB
C
// Copyright 2010 The Go Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style
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// license that can be found in the LICENSE file.
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#include <errno.h>
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#include <signal.h>
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#include "runtime.h"
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#include "go-assert.h"
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/* For targets which don't have the required sync support. Really
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these should be provided by gcc itself. FIXME. */
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#if !defined (HAVE_SYNC_BOOL_COMPARE_AND_SWAP_4) || !defined (HAVE_SYNC_FETCH_AND_ADD_4)
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static pthread_mutex_t sync_lock = PTHREAD_MUTEX_INITIALIZER;
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#endif
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#ifndef HAVE_SYNC_BOOL_COMPARE_AND_SWAP_4
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_Bool
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__sync_bool_compare_and_swap_4 (uint32*, uint32, uint32)
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__attribute__ ((visibility ("hidden")));
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_Bool
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__sync_bool_compare_and_swap_4 (uint32* ptr, uint32 old, uint32 new)
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{
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int i;
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_Bool ret;
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i = pthread_mutex_lock (&sync_lock);
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__go_assert (i == 0);
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if (*ptr != old)
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ret = 0;
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else
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{
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*ptr = new;
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ret = 1;
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}
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i = pthread_mutex_unlock (&sync_lock);
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__go_assert (i == 0);
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return ret;
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}
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#endif
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#ifndef HAVE_SYNC_FETCH_AND_ADD_4
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uint32
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__sync_fetch_and_add_4 (uint32*, uint32)
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__attribute__ ((visibility ("hidden")));
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uint32
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__sync_fetch_and_add_4 (uint32* ptr, uint32 add)
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{
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int i;
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uint32 ret;
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i = pthread_mutex_lock (&sync_lock);
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__go_assert (i == 0);
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ret = *ptr;
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*ptr += add;
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i = pthread_mutex_unlock (&sync_lock);
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__go_assert (i == 0);
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return ret;
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}
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#endif
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// Called to initialize a new m (including the bootstrap m).
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void
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runtime_minit(void)
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{
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byte* stack;
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size_t stacksize;
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stack_t ss;
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// Initialize signal handling.
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runtime_m()->gsignal = runtime_malg(32*1024, &stack, &stacksize); // OS X wants >=8K, Linux >=2K
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ss.ss_sp = stack;
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ss.ss_flags = 0;
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ss.ss_size = stacksize;
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if(sigaltstack(&ss, nil) < 0)
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*(int *)0xf1 = 0xf1;
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}
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