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// Copyright 2018 Mimecast Ltd.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
#include "rthread.h"
#include <sys/types.h>
#include "rworker.h"
#include "rprocess.h"
#include "rioop.h"
#ifdef THREAD_DEBUG
/**
* @brief For debugging purposes only
*
* @param t The responsible thread object
*/
static void _rthread_init_log(rthread_s *t)
{
rworker_s *w = t->worker;
char *rthread_log = Calloc(1024, char);
snprintf(rthread_log, 1023, "/tmp/ioreplay/worker%d.thread%ld.debuglog",
w->rworker_num, (long)pthread_self());
ensure_dir_exists("/tmp/ioreplay");
t->rthread_fd = Fopen(rthread_log, "a");
free(rthread_log);
fprintf(t->rthread_fd, "%ld: DEBUG: Created thread log\n", t->tid);
}
#endif
void rthread_process_task(rthread_s* t, rtask_s *task,
pid_t pthread_id)
{
char *next = task->line;
rworker_s *w = (rworker_s*) task->worker;
// Tokenize the remaining elements of the line.
int ntoks = 0;
char *saveptr;
char *tok = strtok_r(next, "|", &saveptr);
while (tok) {
if (ntoks > MAX_TOKENS) {
Error("worker(%d) pthread(%d): lineno:%lu, missing newline?",
w->rworker_num, pthread_id, task->lineno);
}
task->toks[ntoks++] = tok;
tok = strtok_r(NULL, "|", &saveptr);
}
// NULL marker (no more token from here)
task->toks[ntoks] = NULL;
#ifdef THREAD_DEBUG
fprintf(t->rthread_fd, "%ld(%ld): %s",
t->tid, (long)pthread_self(), task->clone);
fflush(t->rthread_fd);
free(task->clone);
task->clone = NULL;
#endif
#ifndef NO_RIOOP
// Perform the corresponding I/O operation!
rioop_run(task->process, t, task);
#endif
// Make the task object recyclable/reusable
pthread_mutex_lock(&w->task_buffer_mutex);
if (!rbuffer_insert(w->task_buffer, task))
// We can't recycle the task object if the buffer is full!
rtask_destroy(task);
pthread_mutex_unlock(&w->task_buffer_mutex);
}
void *rthread_pthread_start(void *data)
{
rthread_s* t = (rthread_s*) data;
rworker_s *w = t->worker;
rtask_s *task = NULL;
pid_t pthread_id = pthread_self();
#ifdef THREAD_DEBUG
_rthread_init_log(t);
#endif
do {
while (!rbuffer_has_next(t->tasks) && !t->terminate)
usleep(100);
while ((task = rbuffer_get_next(t->tasks)) != NULL)
rthread_process_task(t, task, pthread_id);
#ifdef THREAD_DEBUG
fprintf(t->rthread_fd, "%ld: DEBUG: Idling\n", t->tid);
fflush(t->rthread_fd);
#endif
// Tell rworker_s that thread is not doing any work!
int inserted = false;
while (!inserted && !t->terminate) {
if (rbuffer_has_next(t->tasks))
break;
usleep(1000);
if (rbuffer_has_next(t->tasks))
break;
// Make the rthread reusable, he is without any tasks
// for some time.
pthread_mutex_lock(&w->rthread_buffer_mutex);
inserted = rbuffer_insert(w->rthread_buffer, t);
pthread_mutex_unlock(&w->rthread_buffer_mutex);
}
#ifdef THREAD_DEBUG
if (inserted) {
fprintf(t->rthread_fd, "%ld: DEBUG: Added to thread buffer\n",
t->tid);
} else {
fprintf(t->rthread_fd, "%ld: DEBUG: Idling thread recovered\n",
t->tid);
}
fflush(t->rthread_fd);
#endif
} while (!t->terminate);
#ifdef THREAD_DEBUG
fprintf(t->rthread_fd, "%ld: DEBUG: Terminating\n", t->tid);
fflush(t->rthread_fd);
#endif
// Process the very last tasks
while (NULL != (task = rbuffer_get_next(t->tasks)))
rthread_process_task(t, task, pthread_id);
#ifdef THREAD_DEBUG
fprintf(t->rthread_fd, "%ld: DEBUG: Done terminating\n", t->tid);
fflush(t->rthread_fd);
#endif
return NULL;
}
rthread_s* rthread_new(const long tid, void *worker)
{
rthread_s *t = Malloc(rthread_s);
rworker_s *w = worker;
t->single_threaded = w->opts->num_threads_per_worker == 1;
t->tasks = rbuffer_new(TASK_BUFFER_PER_THREAD);
t->terminate = false;
t->worker = worker;
rthread_update(t, tid);
if (t->single_threaded) {
#ifdef THREAD_DEBUG
_rthread_init_log(t);
#endif
return t;
}
start_pthread(&t->pthread, rthread_pthread_start, (void*)t);
return t;
}
long rthread_update(rthread_s *t, const long tid)
{
long prev_tid = t->tid;
t->tid = tid;
return prev_tid;
}
void rthread_destroy(rthread_s *t)
{
if (rbuffer_has_next(t->tasks)) {
Error("Didn't expect to have any tasks left!");
}
rbuffer_destroy(t->tasks);
#ifdef THREAD_DEBUG
if (t->rthread_fd)
fclose(t->rthread_fd);
#endif
free(t);
}
bool rthread_insert_task(rthread_s* t, rtask_s* task)
{
if (t->single_threaded) {
rthread_process_task(t, task, pthread_self());
return true;
}
return rbuffer_insert(t->tasks, task);
}
void rthread_terminate(rthread_s* t)
{
t->terminate = true;
pthread_join(t->pthread, NULL);
}
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