7a9389330e
gcc/: * gcc.c (default_compilers): Add entry for ".go". * common.opt: Add -static-libgo as a driver option. * doc/install.texi (Configuration): Mention libgo as an option for --enable-shared. Mention go as an option for --enable-languages. * doc/invoke.texi (Overall Options): Mention .go as a file name suffix. Mention go as a -x option. * doc/frontends.texi (G++ and GCC): Mention Go as a supported language. * doc/sourcebuild.texi (Top Level): Mention libgo. * doc/standards.texi (Standards): Add section on Go language. Move references for other languages into their own section. * doc/contrib.texi (Contributors): Mention that I contributed the Go frontend. gcc/testsuite/: * lib/go.exp: New file. * lib/go-dg.exp: New file. * lib/go-torture.exp: New file. * lib/target-supports.exp (check_compile): Match // Go. From-SVN: r167407
113 lines
2.8 KiB
C
113 lines
2.8 KiB
C
/* go-send-nb-small.c -- nonblocking send of something small on a channel.
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Copyright 2009 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 <stdint.h>
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#include "go-assert.h"
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#include "go-panic.h"
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#include "channel.h"
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/* Prepare to send something on a nonblocking channel. */
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int
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__go_send_nonblocking_acquire (struct __go_channel *channel)
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{
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int i;
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_Bool has_space;
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i = pthread_mutex_lock (&channel->lock);
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__go_assert (i == 0);
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while (channel->selected_for_send)
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{
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i = pthread_cond_wait (&channel->cond, &channel->lock);
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__go_assert (i == 0);
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}
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if (channel->is_closed)
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{
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++channel->closed_op_count;
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if (channel->closed_op_count >= MAX_CLOSED_OPERATIONS)
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{
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i = pthread_mutex_unlock (&channel->lock);
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__go_assert (i == 0);
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__go_panic_msg ("too many operations on closed channel");
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}
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i = pthread_mutex_unlock (&channel->lock);
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__go_assert (i == 0);
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return SEND_NONBLOCKING_ACQUIRE_CLOSED;
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}
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if (channel->num_entries > 0)
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has_space = ((channel->next_store + 1) % channel->num_entries
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!= channel->next_fetch);
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else
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{
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/* This is a synchronous channel. If somebody is current
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sending, then we can't send. Otherwise, see if somebody is
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waiting to receive, or see if we can synch with a select. */
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if (channel->waiting_to_send)
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{
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/* Some other goroutine is currently sending on this
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channel, which means that we can't. */
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has_space = 0;
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}
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else if (channel->waiting_to_receive)
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{
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/* Some other goroutine is waiting to receive a value, so we
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can send directly to them. */
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has_space = 1;
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}
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else if (__go_synch_with_select (channel, 1))
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{
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/* We found a select waiting to receive data, so we can send
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to that. */
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__go_broadcast_to_select (channel);
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has_space = 1;
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}
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else
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{
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/* Otherwise, we can't send, because nobody is waiting to
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receive. */
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has_space = 0;
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}
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if (has_space)
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{
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channel->waiting_to_send = 1;
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__go_assert (channel->next_store == 0);
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}
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}
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if (!has_space)
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{
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i = pthread_mutex_unlock (&channel->lock);
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__go_assert (i == 0);
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return SEND_NONBLOCKING_ACQUIRE_NOSPACE;
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}
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return SEND_NONBLOCKING_ACQUIRE_SPACE;
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}
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/* Send something 64 bits or smaller on a channel. */
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_Bool
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__go_send_nonblocking_small (struct __go_channel *channel, uint64_t val)
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{
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__go_assert (channel->element_size <= sizeof (uint64_t));
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int data = __go_send_nonblocking_acquire (channel);
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if (data != SEND_NONBLOCKING_ACQUIRE_SPACE)
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return data == SEND_NONBLOCKING_ACQUIRE_CLOSED;
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channel->data[channel->next_store] = val;
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__go_send_release (channel);
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return 1;
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}
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