131 lines
2.5 KiB
C
131 lines
2.5 KiB
C
/* Copyright (c) 2021-2023 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 _GNU_SOURCE
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#include <nanos6.h>
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#include <nanos6/library-mode.h>
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#include <pthread.h>
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#include <stdlib.h>
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#include <time.h>
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#include "common.h"
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#include "compat.h"
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#include "ovni.h"
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volatile int complete = 0;
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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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static void
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complete_func(void *arg)
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{
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UNUSED(arg);
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complete = 1;
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}
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static inline void
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instr_thread_start(int32_t cpu, int32_t creator_tid, uint64_t tag)
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{
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ovni_thread_init(get_tid());
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struct ovni_ev ev = {0};
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ovni_ev_set_mcv(&ev, "OHx");
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ovni_ev_set_clock(&ev, ovni_clock_now());
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ovni_payload_add(&ev, (uint8_t *) &cpu, sizeof(cpu));
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ovni_payload_add(&ev, (uint8_t *) &creator_tid, sizeof(creator_tid));
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ovni_payload_add(&ev, (uint8_t *) &tag, sizeof(tag));
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ovni_ev_emit(&ev);
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/* Flush the events to disk before killing the thread */
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ovni_flush();
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}
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static inline void
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instr_thread_end(void)
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{
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struct ovni_ev ev = {0};
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ovni_ev_set_mcv(&ev, "OHe");
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ovni_ev_set_clock(&ev, ovni_clock_now());
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ovni_ev_emit(&ev);
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/* Flush the events to disk before killing the thread */
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ovni_flush();
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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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/* Inform ovni of this external thread */
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instr_thread_start(-1, -1, 0);
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nanos6_spawn_function(polling_func, arg,
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complete_func, NULL, "polling_task");
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/* Then inform that the thread finishes */
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instr_thread_end();
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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 = malloc(sizeof(double));
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if (T == NULL)
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die("malloc failed:");
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*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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while (!complete)
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sleep_us(100);
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free(T);
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return 0;
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}
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