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-rw-r--r--lib/sqfs/data_writer/pthread.c332
1 files changed, 332 insertions, 0 deletions
diff --git a/lib/sqfs/data_writer/pthread.c b/lib/sqfs/data_writer/pthread.c
new file mode 100644
index 0000000..3170c11
--- /dev/null
+++ b/lib/sqfs/data_writer/pthread.c
@@ -0,0 +1,332 @@
+/* SPDX-License-Identifier: LGPL-3.0-or-later */
+/*
+ * pthread.c
+ *
+ * Copyright (C) 2019 David Oberhollenzer <goliath@infraroot.at>
+ */
+#define SQFS_BUILDING_DLL
+#include "internal.h"
+
+static void *worker_proc(void *arg)
+{
+ compress_worker_t *worker = arg;
+ sqfs_data_writer_t *shared = worker->shared;
+ sqfs_block_t *blk = NULL;
+ int status = 0;
+
+ for (;;) {
+ pthread_mutex_lock(&shared->mtx);
+ if (blk != NULL) {
+ data_writer_store_done(shared, blk, status);
+ pthread_cond_broadcast(&shared->done_cond);
+ }
+
+ while (shared->queue == NULL && shared->status == 0)
+ pthread_cond_wait(&shared->queue_cond, &shared->mtx);
+
+ blk = data_writer_next_work_item(shared);
+ pthread_mutex_unlock(&shared->mtx);
+
+ if (blk == NULL)
+ break;
+
+ status = data_writer_do_block(blk, worker->cmp,
+ worker->scratch,
+ shared->max_block_size);
+ }
+ return NULL;
+}
+
+sqfs_data_writer_t *sqfs_data_writer_create(size_t max_block_size,
+ sqfs_compressor_t *cmp,
+ unsigned int num_workers,
+ size_t max_backlog,
+ size_t devblksz,
+ sqfs_file_t *file)
+{
+ sqfs_data_writer_t *proc;
+ unsigned int i;
+ int ret;
+
+ if (num_workers < 1)
+ num_workers = 1;
+
+ proc = alloc_flex(sizeof(*proc),
+ sizeof(proc->workers[0]), num_workers);
+ if (proc == NULL)
+ return NULL;
+
+ proc->mtx = (pthread_mutex_t)PTHREAD_MUTEX_INITIALIZER;
+ proc->queue_cond = (pthread_cond_t)PTHREAD_COND_INITIALIZER;
+ proc->done_cond = (pthread_cond_t)PTHREAD_COND_INITIALIZER;
+
+ if (data_writer_init(proc, max_block_size, cmp, num_workers,
+ max_backlog, devblksz, file)) {
+ goto fail_init;
+ }
+
+ for (i = 0; i < num_workers; ++i) {
+ proc->workers[i] = alloc_flex(sizeof(compress_worker_t),
+ 1, max_block_size);
+
+ if (proc->workers[i] == NULL)
+ goto fail_init;
+
+ proc->workers[i]->shared = proc;
+ proc->workers[i]->cmp = cmp->create_copy(cmp);
+
+ if (proc->workers[i]->cmp == NULL)
+ goto fail_init;
+ }
+
+ for (i = 0; i < num_workers; ++i) {
+ ret = pthread_create(&proc->workers[i]->thread, NULL,
+ worker_proc, proc->workers[i]);
+
+ if (ret != 0)
+ goto fail_thread;
+ }
+
+ return proc;
+fail_thread:
+ pthread_mutex_lock(&proc->mtx);
+ proc->status = -1;
+ pthread_cond_broadcast(&proc->queue_cond);
+ pthread_mutex_unlock(&proc->mtx);
+
+ for (i = 0; i < num_workers; ++i) {
+ if (proc->workers[i]->thread > 0) {
+ pthread_join(proc->workers[i]->thread, NULL);
+ }
+ }
+fail_init:
+ for (i = 0; i < num_workers; ++i) {
+ if (proc->workers[i] != NULL) {
+ if (proc->workers[i]->cmp != NULL) {
+ proc->workers[i]->cmp->
+ destroy(proc->workers[i]->cmp);
+ }
+
+ free(proc->workers[i]);
+ }
+ }
+ pthread_cond_destroy(&proc->done_cond);
+ pthread_cond_destroy(&proc->queue_cond);
+ pthread_mutex_destroy(&proc->mtx);
+ data_writer_cleanup(proc);
+ return NULL;
+}
+
+void sqfs_data_writer_destroy(sqfs_data_writer_t *proc)
+{
+ unsigned int i;
+
+ pthread_mutex_lock(&proc->mtx);
+ proc->status = -1;
+ pthread_cond_broadcast(&proc->queue_cond);
+ pthread_mutex_unlock(&proc->mtx);
+
+ for (i = 0; i < proc->num_workers; ++i) {
+ pthread_join(proc->workers[i]->thread, NULL);
+
+ proc->workers[i]->cmp->destroy(proc->workers[i]->cmp);
+ free(proc->workers[i]);
+ }
+
+ pthread_cond_destroy(&proc->done_cond);
+ pthread_cond_destroy(&proc->queue_cond);
+ pthread_mutex_destroy(&proc->mtx);
+
+ data_writer_cleanup(proc);
+}
+
+static void append_to_work_queue(sqfs_data_writer_t *proc,
+ sqfs_block_t *block)
+{
+ if (proc->queue_last == NULL) {
+ proc->queue = proc->queue_last = block;
+ } else {
+ proc->queue_last->next = block;
+ proc->queue_last = block;
+ }
+
+ block->sequence_number = proc->enqueue_id++;
+ block->next = NULL;
+ proc->backlog += 1;
+ pthread_cond_broadcast(&proc->queue_cond);
+}
+
+static int test_and_set_status(sqfs_data_writer_t *proc, int status)
+{
+ pthread_mutex_lock(&proc->mtx);
+ if (proc->status == 0) {
+ proc->status = status;
+ } else {
+ status = proc->status;
+ }
+ pthread_cond_broadcast(&proc->queue_cond);
+ return status;
+}
+
+static sqfs_block_t *try_dequeue(sqfs_data_writer_t *proc)
+{
+ sqfs_block_t *queue, *it, *prev;
+
+ it = proc->done;
+ prev = NULL;
+
+ while (it != NULL && it->sequence_number == proc->dequeue_id) {
+ prev = it;
+ it = it->next;
+ proc->dequeue_id += 1;
+ }
+
+ if (prev == NULL) {
+ queue = NULL;
+ } else {
+ queue = proc->done;
+ prev->next = NULL;
+ proc->done = it;
+ }
+
+ return queue;
+}
+
+static sqfs_block_t *queue_merge(sqfs_block_t *lhs, sqfs_block_t *rhs)
+{
+ sqfs_block_t *it, *head = NULL, **next_ptr = &head;
+
+ while (lhs != NULL && rhs != NULL) {
+ if (lhs->sequence_number <= rhs->sequence_number) {
+ it = lhs;
+ lhs = lhs->next;
+ } else {
+ it = rhs;
+ rhs = rhs->next;
+ }
+
+ *next_ptr = it;
+ next_ptr = &it->next;
+ }
+
+ it = (lhs != NULL ? lhs : rhs);
+ *next_ptr = it;
+ return head;
+}
+
+static int process_done_queue(sqfs_data_writer_t *proc, sqfs_block_t *queue)
+{
+ sqfs_block_t *it, *block = NULL;
+ int status = 0;
+
+ while (queue != NULL && status == 0) {
+ it = queue;
+ queue = it->next;
+
+ if (it->flags & SQFS_BLK_IS_FRAGMENT) {
+ block = NULL;
+ status = process_completed_fragment(proc, it, &block);
+
+ if (block != NULL && status == 0) {
+ pthread_mutex_lock(&proc->mtx);
+ proc->dequeue_id = it->sequence_number;
+ block->sequence_number = it->sequence_number;
+
+ if (proc->queue == NULL) {
+ proc->queue = block;
+ proc->queue_last = block;
+ } else {
+ block->next = proc->queue;
+ proc->queue = block;
+ }
+
+ proc->backlog += 1;
+ proc->done = queue_merge(queue, proc->done);
+ pthread_cond_broadcast(&proc->queue_cond);
+ pthread_mutex_unlock(&proc->mtx);
+
+ queue = NULL;
+ } else {
+ free(block);
+ }
+ } else {
+ status = process_completed_block(proc, it);
+ }
+
+ free(it);
+ }
+
+ free_blk_list(queue);
+ return status;
+}
+
+int sqfs_data_writer_enqueue(sqfs_data_writer_t *proc, sqfs_block_t *block)
+{
+ sqfs_block_t *queue;
+ int status;
+
+ if (block->flags & ~SQFS_BLK_USER_SETTABLE_FLAGS) {
+ free(block);
+ return test_and_set_status(proc, SQFS_ERROR_UNSUPPORTED);
+ }
+
+ pthread_mutex_lock(&proc->mtx);
+ while (proc->backlog > proc->max_backlog && proc->status == 0)
+ pthread_cond_wait(&proc->done_cond, &proc->mtx);
+
+ if (proc->status != 0) {
+ status = proc->status;
+ pthread_mutex_unlock(&proc->mtx);
+ free(block);
+ return status;
+ }
+
+ append_to_work_queue(proc, block);
+ block = NULL;
+
+ queue = try_dequeue(proc);
+ pthread_mutex_unlock(&proc->mtx);
+
+ status = process_done_queue(proc, queue);
+ if (status != 0)
+ return test_and_set_status(proc, status);
+
+ return 0;
+}
+
+int sqfs_data_writer_finish(sqfs_data_writer_t *proc)
+{
+ sqfs_block_t *queue;
+ int status = 0;
+
+ for (;;) {
+ pthread_mutex_lock(&proc->mtx);
+ while (proc->backlog > 0 && proc->status == 0)
+ pthread_cond_wait(&proc->done_cond, &proc->mtx);
+
+ if (proc->status != 0) {
+ status = proc->status;
+ pthread_mutex_unlock(&proc->mtx);
+ return status;
+ }
+
+ queue = proc->done;
+ proc->done = NULL;
+ pthread_mutex_unlock(&proc->mtx);
+
+ if (queue == NULL) {
+ if (proc->frag_block != NULL) {
+ append_to_work_queue(proc, proc->frag_block);
+ proc->frag_block = NULL;
+ continue;
+ }
+ break;
+ }
+
+ status = process_done_queue(proc, queue);
+ if (status != 0)
+ return status;
+ }
+
+ return 0;
+}
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