The Fuchsia Authors
79 linhas
1.9 KiB
C
79 linhas
1.9 KiB
C
// Copyright 2016 The Fuchsia Authors
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// Copyright (c) 2012 Travis Geiselbrecht
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//
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// Use of this source code is governed by a MIT-style
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// license that can be found in the LICENSE file or at
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// https://opensource.org/licenses/MIT
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#include <stdio.h>
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#include <rand.h>
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#include <err.h>
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#include <app/tests.h>
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#include <kernel/thread.h>
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#include <kernel/mutex.h>
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#include <kernel/semaphore.h>
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#include <kernel/event.h>
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#include <platform.h>
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static int fibo_thread(void *argv)
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{
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long fibo = (intptr_t)argv;
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thread_t *t[2];
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if (fibo == 0)
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return 0;
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if (fibo == 1)
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return 1;
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char name[32];
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snprintf(name, sizeof(name), "fibo %lu", fibo - 1);
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t[0] = thread_create(name, &fibo_thread, (void *)(fibo - 1), DEFAULT_PRIORITY, DEFAULT_STACK_SIZE);
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if (!t[0]) {
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printf("error creating thread for fibo %d\n", fibo-1);
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return 0;
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}
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snprintf(name, sizeof(name), "fibo %lu", fibo - 2);
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t[1] = thread_create(name, &fibo_thread, (void *)(fibo - 2), DEFAULT_PRIORITY, DEFAULT_STACK_SIZE);
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if (!t[1]) {
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printf("error creating thread for fibo %d\n", fibo-2);
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thread_resume(t[0]);
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thread_join(t[0], NULL, INFINITE_TIME);
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return 0;
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}
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thread_resume(t[0]);
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thread_resume(t[1]);
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int retcode0, retcode1;
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thread_join(t[0], &retcode0, INFINITE_TIME);
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thread_join(t[1], &retcode1, INFINITE_TIME);
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return retcode0 + retcode1;
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}
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int fibo(int argc, const cmd_args *argv)
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{
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if (argc < 2) {
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printf("not enough args\n");
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return -1;
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}
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lk_time_t tim = current_time();
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thread_t *t = thread_create("fibo", &fibo_thread, (void *)(uintptr_t)argv[1].u, DEFAULT_PRIORITY, DEFAULT_STACK_SIZE);
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thread_resume(t);
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int retcode;
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thread_join(t, &retcode, INFINITE_TIME);
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tim = current_time() - tim;
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printf("fibo %d\n", retcode);
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printf("took %u msecs to calculate\n", tim);
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return NO_ERROR;
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}
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