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opentracker/ot_mutex.c

275 lines
7.2 KiB
C

/* This software was written by Dirk Engling <erdgeist@erdgeist.org>
It is considered beerware. Prost. Skol. Cheers or whatever.
$id$ */
/* System */
#include <pthread.h>
#include <stdio.h>
#include <stdlib.h>
#include <sys/mman.h>
#include <sys/uio.h>
/* Libowfat */
#include "byte.h"
#include "io.h"
#include "uint32.h"
/* Opentracker */
#include "ot_iovec.h"
#include "ot_mutex.h"
#include "ot_stats.h"
#include "trackerlogic.h"
/* #define MTX_DBG( STRING ) fprintf( stderr, STRING ) */
#define MTX_DBG(STRING)
/* Our global all torrents list */
static ot_vector all_torrents[OT_BUCKET_COUNT];
static pthread_mutex_t bucket_mutex[OT_BUCKET_COUNT];
static size_t g_torrent_count;
/* Self pipe from opentracker.c */
extern int g_self_pipe[2];
ot_vector *mutex_bucket_lock(int bucket) {
pthread_mutex_lock(bucket_mutex + bucket);
return all_torrents + bucket;
}
ot_vector *mutex_bucket_lock_by_hash(ot_hash const hash) { return mutex_bucket_lock(uint32_read_big((const char *)hash) >> OT_BUCKET_COUNT_SHIFT); }
void mutex_bucket_unlock(int bucket, int delta_torrentcount) {
pthread_mutex_unlock(bucket_mutex + bucket);
g_torrent_count += delta_torrentcount;
}
void mutex_bucket_unlock_by_hash(ot_hash const hash, int delta_torrentcount) {
mutex_bucket_unlock(uint32_read_big((char *)hash) >> OT_BUCKET_COUNT_SHIFT, delta_torrentcount);
}
size_t mutex_get_torrent_count() { return g_torrent_count; }
/* TaskQueue Magic */
struct ot_task {
ot_taskid taskid;
ot_tasktype tasktype;
int64 sock;
int iovec_entries;
struct iovec *iovec;
struct ot_task *next;
};
static ot_taskid next_free_taskid = 1;
static struct ot_task *tasklist;
static pthread_mutex_t tasklist_mutex;
static pthread_cond_t tasklist_being_filled;
int mutex_workqueue_pushtask(int64 sock, ot_tasktype tasktype) {
struct ot_task **tmptask, *task;
task = malloc(sizeof(struct ot_task));
if (!task)
return -1;
task->taskid = 0;
task->tasktype = tasktype;
task->sock = sock;
task->iovec_entries = 0;
task->iovec = NULL;
task->next = 0;
/* Want exclusive access to tasklist */
pthread_mutex_lock(&tasklist_mutex);
/* Skip to end of list */
tmptask = &tasklist;
while (*tmptask)
tmptask = &(*tmptask)->next;
*tmptask = task;
/* Inform waiting workers and release lock */
pthread_cond_broadcast(&tasklist_being_filled);
pthread_mutex_unlock(&tasklist_mutex);
return 0;
}
void mutex_workqueue_canceltask(int64 sock) {
struct ot_task **task;
/* Want exclusive access to tasklist */
pthread_mutex_lock(&tasklist_mutex);
for (task = &tasklist; *task; task = &((*task)->next))
if ((*task)->sock == sock) {
struct iovec *iovec = (*task)->iovec;
struct ot_task *ptask = *task;
int i;
/* Free task's iovec */
for (i = 0; i < (*task)->iovec_entries; ++i)
free(iovec[i].iov_base);
*task = (*task)->next;
free(ptask);
break;
}
/* Release lock */
pthread_mutex_unlock(&tasklist_mutex);
}
ot_taskid mutex_workqueue_poptask(ot_tasktype *tasktype) {
struct ot_task *task;
ot_taskid taskid = 0;
/* Want exclusive access to tasklist */
pthread_mutex_lock(&tasklist_mutex);
while (!taskid) {
/* Skip to the first unassigned task this worker wants to do */
for (task = tasklist; task; task = task->next)
if (!task->taskid && (TASK_CLASS_MASK & task->tasktype) == *tasktype) {
/* If we found an outstanding task, assign a taskid to it
and leave the loop */
task->taskid = taskid = ++next_free_taskid;
*tasktype = task->tasktype;
break;
}
/* Wait until the next task is being fed */
if (!taskid)
pthread_cond_wait(&tasklist_being_filled, &tasklist_mutex);
}
/* Release lock */
pthread_mutex_unlock(&tasklist_mutex);
return taskid;
}
void mutex_workqueue_pushsuccess(ot_taskid taskid) {
struct ot_task **task;
/* Want exclusive access to tasklist */
pthread_mutex_lock(&tasklist_mutex);
for (task = &tasklist; *task; task = &((*task)->next))
if ((*task)->taskid == taskid) {
struct ot_task *ptask = *task;
*task = (*task)->next;
free(ptask);
break;
}
/* Release lock */
pthread_mutex_unlock(&tasklist_mutex);
}
int mutex_workqueue_pushresult(ot_taskid taskid, int iovec_entries, struct iovec *iovec) {
struct ot_task *task;
const char byte = 'o';
/* Want exclusive access to tasklist */
pthread_mutex_lock(&tasklist_mutex);
for (task = tasklist; task; task = task->next)
if (task->taskid == taskid) {
task->iovec_entries = iovec_entries;
task->iovec = iovec;
task->tasktype = TASK_DONE;
break;
}
/* Release lock */
pthread_mutex_unlock(&tasklist_mutex);
io_trywrite(g_self_pipe[1], &byte, 1);
/* Indicate whether the worker has to throw away results */
return task ? 0 : -1;
}
int mutex_workqueue_pushchunked(ot_taskid taskid, struct iovec *iovec) {
struct ot_task *task;
const char byte = 'o';
/* Want exclusive access to tasklist */
pthread_mutex_lock(&tasklist_mutex);
for (task = tasklist; task; task = task->next)
if (task->taskid == taskid) {
if (iovec) {
if (iovec_append(&task->iovec_entries, &task->iovec, iovec))
task->tasktype = TASK_DONE_PARTIAL;
else
task = NULL;
} else
task->tasktype = TASK_DONE;
break;
}
/* Release lock */
pthread_mutex_unlock(&tasklist_mutex);
io_trywrite(g_self_pipe[1], &byte, 1);
/* Indicate whether the worker has to throw away results */
return task ? 0 : -1;
}
int64 mutex_workqueue_popresult(int *iovec_entries, struct iovec **iovec, int *is_partial) {
struct ot_task **task;
int64 sock = -1;
*is_partial = 0;
/* Want exclusive access to tasklist */
pthread_mutex_lock(&tasklist_mutex);
for (task = &tasklist; *task; task = &((*task)->next))
if (((*task)->tasktype & TASK_CLASS_MASK) == TASK_DONE) {
struct ot_task *ptask = *task;
*iovec_entries = ptask->iovec_entries;
*iovec = ptask->iovec;
sock = ptask->sock;
if ((*task)->tasktype == TASK_DONE) {
*task = ptask->next;
free(ptask);
} else {
ptask->iovec_entries = 0;
ptask->iovec = NULL;
*is_partial = 1;
/* Prevent task from showing up immediately again unless new data was added */
(*task)->tasktype = TASK_FULLSCRAPE;
}
break;
}
/* Release lock */
pthread_mutex_unlock(&tasklist_mutex);
return sock;
}
void mutex_init() {
int i;
pthread_mutex_init(&tasklist_mutex, NULL);
pthread_cond_init(&tasklist_being_filled, NULL);
for (i = 0; i < OT_BUCKET_COUNT; ++i)
pthread_mutex_init(bucket_mutex + i, NULL);
byte_zero(all_torrents, sizeof(all_torrents));
}
void mutex_deinit() {
int i;
for (i = 0; i < OT_BUCKET_COUNT; ++i)
pthread_mutex_destroy(bucket_mutex + i);
pthread_mutex_destroy(&tasklist_mutex);
pthread_cond_destroy(&tasklist_being_filled);
byte_zero(all_torrents, sizeof(all_torrents));
}
const char *g_version_mutex_c = "$Source$: $Revision$\n";