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brotli-mt_compress.c
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brotli-mt_compress.c
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/**
* Copyright (c) 2016 - 2017 Tino Reichardt
* All rights reserved.
*
* This source code is licensed under the BSD-style license found in the
* LICENSE file in the root directory of this source tree. An additional grant
* of patent rights can be found in the PATENTS file in the same directory.
*
* You can contact the author at:
* - zstdmt source repository: https://github.com/mcmilk/zstdmt
*/
#include <stdlib.h>
#include <string.h>
#include "encode.h"
#include "brotli-mt.h"
#include "memmt.h"
#include "threading.h"
#include "list.h"
/**
* multi threaded brotli - multiple workers version
*
* - each thread works on his own
* - no main thread which does reading and then starting the work
* - needs a callback for reading / writing
* - each worker does his:
* 1) get read mutex and read some input
* 2) release read mutex and do compression
* 3) get write mutex and write result
* 4) begin with step 1 again, until no input
*/
/* worker for compression */
typedef struct {
BROTLIMT_CCtx *ctx;
pthread_t pthread;
} cwork_t;
struct writelist;
struct writelist {
size_t frame;
BROTLIMT_Buffer out;
struct list_head node;
};
struct BROTLIMT_CCtx_s {
int level;
/* threads: 1..BROTLIMT_THREAD_MAX */
int threads;
/* should be used for read from input */
int inputsize;
/* statistic */
size_t insize;
size_t outsize;
size_t curframe;
size_t frames;
/* threading */
cwork_t *cwork;
/* reading input */
pthread_mutex_t read_mutex;
fn_read *fn_read;
void *arg_read;
/* writing output */
pthread_mutex_t write_mutex;
fn_write *fn_write;
void *arg_write;
/* lists for writing queue */
struct list_head writelist_free;
struct list_head writelist_busy;
struct list_head writelist_done;
};
/* **************************************
* Compression
****************************************/
BROTLIMT_CCtx *BROTLIMT_createCCtx(int threads, int level, int inputsize)
{
BROTLIMT_CCtx *ctx;
int t;
/* allocate ctx */
ctx = (BROTLIMT_CCtx *) malloc(sizeof(BROTLIMT_CCtx));
if (!ctx)
return 0;
/* check threads value */
if (threads < 1 || threads > BROTLIMT_THREAD_MAX)
return 0;
/* check level */
if (level < BROTLIMT_LEVEL_MIN || level > BROTLIMT_LEVEL_MAX)
return 0;
/* calculate chunksize for one thread */
if (inputsize)
ctx->inputsize = inputsize;
else
ctx->inputsize = 1024 * 1024 * (level ? level : 1);
/* setup ctx */
ctx->level = level;
ctx->threads = threads;
ctx->insize = 0;
ctx->outsize = 0;
ctx->frames = 0;
ctx->curframe = 0;
pthread_mutex_init(&ctx->read_mutex, NULL);
pthread_mutex_init(&ctx->write_mutex, NULL);
/* free -> busy -> out -> free -> ... */
INIT_LIST_HEAD(&ctx->writelist_free); /* free, can be used */
INIT_LIST_HEAD(&ctx->writelist_busy); /* busy */
INIT_LIST_HEAD(&ctx->writelist_done); /* can be written */
ctx->cwork = (cwork_t *) malloc(sizeof(cwork_t) * threads);
if (!ctx->cwork)
goto err_cwork;
for (t = 0; t < threads; t++) {
cwork_t *w = &ctx->cwork[t];
w->ctx = ctx;
}
return ctx;
err_cwork:
free(ctx);
return 0;
}
/**
* mt_error - return mt lib specific error code
*/
static size_t mt_error(int rv)
{
switch (rv) {
case -1:
return MT_ERROR(read_fail);
case -2:
return MT_ERROR(canceled);
case -3:
return MT_ERROR(memory_allocation);
}
return MT_ERROR(read_fail);
}
/**
* pt_write - queue for compressed output
*/
static size_t pt_write(BROTLIMT_CCtx * ctx, struct writelist *wl)
{
struct list_head *entry;
/* move the entry to the done list */
list_move(&wl->node, &ctx->writelist_done);
/* the entry isn't the currently needed, return... */
if (wl->frame != ctx->curframe)
return 0;
again:
/* check, what can be written ... */
list_for_each(entry, &ctx->writelist_done) {
wl = list_entry(entry, struct writelist, node);
if (wl->frame == ctx->curframe) {
int rv = ctx->fn_write(ctx->arg_write, &wl->out);
if (rv != 0)
return mt_error(rv);
ctx->outsize += wl->out.size;
ctx->curframe++;
list_move(entry, &ctx->writelist_free);
goto again;
}
}
return 0;
}
static void *pt_compress(void *arg)
{
cwork_t *w = (cwork_t *) arg;
BROTLIMT_CCtx *ctx = w->ctx;
size_t result;
BROTLIMT_Buffer in;
/* inbuf is constant */
in.size = ctx->inputsize;
in.buf = malloc(in.size);
if (!in.buf)
return (void *)MT_ERROR(memory_allocation);
for (;;) {
struct list_head *entry;
struct writelist *wl;
int rv;
/* allocate space for new output */
pthread_mutex_lock(&ctx->write_mutex);
if (!list_empty(&ctx->writelist_free)) {
/* take unused entry */
entry = list_first(&ctx->writelist_free);
wl = list_entry(entry, struct writelist, node);
wl->out.size =
BrotliEncoderMaxCompressedSize(ctx->inputsize) + 16;
list_move(entry, &ctx->writelist_busy);
} else {
/* allocate new one */
wl = (struct writelist *)
malloc(sizeof(struct writelist));
if (!wl) {
pthread_mutex_unlock(&ctx->write_mutex);
return (void *)MT_ERROR(memory_allocation);
}
wl->out.size =
BrotliEncoderMaxCompressedSize(ctx->inputsize) + 16;
wl->out.buf = malloc(wl->out.size);
if (!wl->out.buf) {
pthread_mutex_unlock(&ctx->write_mutex);
return (void *)MT_ERROR(memory_allocation);
}
list_add(&wl->node, &ctx->writelist_busy);
}
pthread_mutex_unlock(&ctx->write_mutex);
/* read new input */
pthread_mutex_lock(&ctx->read_mutex);
in.size = ctx->inputsize;
rv = ctx->fn_read(ctx->arg_read, &in);
if (rv != 0) {
pthread_mutex_unlock(&ctx->read_mutex);
return (void *)mt_error(rv);
}
/* eof */
if (in.size == 0 && ctx->frames > 0) {
free(in.buf);
pthread_mutex_unlock(&ctx->read_mutex);
pthread_mutex_lock(&ctx->write_mutex);
list_move(&wl->node, &ctx->writelist_free);
pthread_mutex_unlock(&ctx->write_mutex);
goto okay;
}
ctx->insize += in.size;
wl->frame = ctx->frames++;
pthread_mutex_unlock(&ctx->read_mutex);
/* compress whole frame */
{
const uint8_t *ibuf = in.buf;
uint8_t *obuf = (uint8_t*)wl->out.buf + 16;
wl->out.size -= 16;
rv = BrotliEncoderCompress(ctx->level,
BROTLI_MAX_WINDOW_BITS,
BROTLI_MODE_GENERIC, in.size,
ibuf, &wl->out.size, obuf);
/* printf("BrotliEncoderCompress() rv=%d in=%zu out=%zu\n", rv, in.size, wl->out.size); */
if (rv == BROTLI_FALSE) {
pthread_mutex_lock(&ctx->write_mutex);
list_move(&wl->node, &ctx->writelist_free);
pthread_mutex_unlock(&ctx->write_mutex);
return (void *)MT_ERROR(frame_compress);
}
}
/* write skippable frame */
MEM_writeLE32((unsigned char *)wl->out.buf + 0,
BROTLIMT_MAGIC_SKIPPABLE);
MEM_writeLE32((unsigned char *)wl->out.buf + 4, 8);
MEM_writeLE32((unsigned char *)wl->out.buf + 8,
(U32) wl->out.size);
/* BR */
MEM_writeLE16((unsigned char *)wl->out.buf + 12,
(U16) BROTLIMT_MAGICNUMBER);
/* number of 64KB blocks needed for decompression */
{
U16 hintsize;
if (ctx->inputsize > (int)in.size) {
hintsize = (U16)(in.size >> 16);
hintsize += 1;
} else
hintsize = ctx->inputsize >> 16;
MEM_writeLE16((unsigned char *)wl->out.buf + 14,
hintsize);
}
wl->out.size += 16;
/* write result */
pthread_mutex_lock(&ctx->write_mutex);
result = pt_write(ctx, wl);
pthread_mutex_unlock(&ctx->write_mutex);
if (BROTLIMT_isError(result))
return (void *)result;
}
okay:
return 0;
}
size_t BROTLIMT_compressCCtx(BROTLIMT_CCtx * ctx, BROTLIMT_RdWr_t * rdwr)
{
int t;
void *retval_of_thread = 0;
if (!ctx)
return MT_ERROR(compressionParameter_unsupported);
/* init reading and writing functions */
ctx->fn_read = rdwr->fn_read;
ctx->fn_write = rdwr->fn_write;
ctx->arg_read = rdwr->arg_read;
ctx->arg_write = rdwr->arg_write;
/* start all workers */
for (t = 0; t < ctx->threads; t++) {
cwork_t *w = &ctx->cwork[t];
pthread_create(&w->pthread, NULL, pt_compress, w);
}
/* wait for all workers */
for (t = 0; t < ctx->threads; t++) {
cwork_t *w = &ctx->cwork[t];
void *p = 0;
pthread_join(w->pthread, &p);
if (p)
retval_of_thread = p;
}
/* clean up lists */
while (!list_empty(&ctx->writelist_free)) {
struct writelist *wl;
struct list_head *entry;
entry = list_first(&ctx->writelist_free);
wl = list_entry(entry, struct writelist, node);
free(wl->out.buf);
list_del(&wl->node);
free(wl);
}
return (size_t) retval_of_thread;
}
/* returns current uncompressed data size */
size_t BROTLIMT_GetInsizeCCtx(BROTLIMT_CCtx * ctx)
{
if (!ctx)
return 0;
return ctx->insize;
}
/* returns the current compressed data size */
size_t BROTLIMT_GetOutsizeCCtx(BROTLIMT_CCtx * ctx)
{
if (!ctx)
return 0;
return ctx->outsize;
}
/* returns the current compressed frames */
size_t BROTLIMT_GetFramesCCtx(BROTLIMT_CCtx * ctx)
{
if (!ctx)
return 0;
return ctx->curframe;
}
void BROTLIMT_freeCCtx(BROTLIMT_CCtx * ctx)
{
if (!ctx)
return;
pthread_mutex_destroy(&ctx->read_mutex);
pthread_mutex_destroy(&ctx->write_mutex);
free(ctx->cwork);
free(ctx);
ctx = 0;
return;
}