57 lines
935 B
C
57 lines
935 B
C
// Copyright 2011 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 "config.h"
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#include <stddef.h>
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#include <sys/types.h>
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#include <sys/time.h>
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#include <sched.h>
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#include <unistd.h>
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#ifdef HAVE_SYS_SELECT_H
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#include <sys/select.h>
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#endif
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#if defined (__i386__) || defined (__x86_64__)
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#include <xmmintrin.h>
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#endif
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#include "runtime.h"
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/* Spin wait. */
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void
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runtime_procyield (uint32 cnt)
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{
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volatile uint32 i;
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for (i = 0; i < cnt; ++i)
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{
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#if defined (__i386__) || defined (__x86_64__)
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_mm_pause ();
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#endif
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}
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}
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/* Ask the OS to reschedule this thread. */
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void
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runtime_osyield (void)
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{
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sched_yield ();
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}
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/* Sleep for some number of microseconds. */
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void
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runtime_usleep (uint32 us)
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{
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struct timeval tv;
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tv.tv_sec = us / 1000000;
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tv.tv_usec = us % 1000000;
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select (0, NULL, NULL, NULL, &tv);
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}
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