72 lines
1.4 KiB
C
72 lines
1.4 KiB
C
/* Copyright (c) 2023 Barcelona Supercomputing Center (BSC)
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* SPDX-License-Identifier: GPL-3.0-or-later */
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/* Spawn a task from an external thread that calls some nanos6
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* functions. The external thread must be paused when the task pauses
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* the execution. This emulates the same behavior as TAMPI when using a
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* polling task. */
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#define _DEFAULT_SOURCE
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#include <nanos6.h>
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#include <nanos6/library-mode.h>
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#include <time.h>
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#include <pthread.h>
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#include "common.h"
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static double
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get_time_ms(void)
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{
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struct timespec ts;
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clock_gettime(CLOCK_MONOTONIC, &ts);
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return (double) ts.tv_sec + (double) ts.tv_nsec * 1.0e-9;
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}
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static void
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dummy_work(double ms)
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{
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double end = get_time_ms() + ms * 1e-3;
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while (get_time_ms() < end);
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}
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static void
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polling_func(void *arg)
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{
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double ms = *((double *) arg);
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double end = get_time_ms() + ms * 1e-3;
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while (get_time_ms() < end) {
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dummy_work(1.0); /* 1 ms */
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nanos6_wait_for(1000UL); /* 1 ms */
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}
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}
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/* Call the nanos6_spawn_function from an external thread */
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static void *
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spawn(void *arg)
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{
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double ms = *((double *) arg);
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nanos6_spawn_function(polling_func, &ms, NULL, NULL, "polling_task");
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return NULL;
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}
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int
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main(void)
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{
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pthread_t th;
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double T = 100.0;
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if (pthread_create(&th, NULL, spawn, &T) != 0)
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die("pthread_create failed:");
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if (pthread_join(th, NULL) != 0)
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die("pthread_join failed:");
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#pragma oss task label("dummy_task")
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dummy_work(T);
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#pragma oss taskwait
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return 0;
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}
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