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Threads: task pointer stored in ngx_file_t.

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This simplifies the interface of the ngx_thread_read() function.

Additionally, most of the thread operations now explicitly set
file->thread_task, file->thread_handler and file->thread_ctx,
to facilitate use of thread operations in other places.

(Potential problems remain with sendfile in threads though - it uses
file->thread_handler as set in ngx_output_chain(), and it should not
be overwritten to an incompatible one.)

In collaboration with Valentin Bartenev.
This commit is contained in:
Maxim Dounin 2016-03-18 06:43:52 +03:00
parent 931ce7f02a
commit ac78b26324
5 changed files with 18 additions and 11 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

1
src/core/ngx_file.h
View File

@ -27,6 +27,7 @@ struct ngx_file_s {
ngx_int_t (*thread_handler)(ngx_thread_task_t *task,
ngx_file_t *file);
void *thread_ctx;
ngx_thread_task_t *thread_task;
#endif
#if (NGX_HAVE_FILE_AIO)

11
src/core/ngx_output_chain.c
View File

@ -577,10 +577,15 @@ ngx_output_chain_copy_buf(ngx_output_chain_ctx_t *ctx)
} else
#endif
#if (NGX_THREADS)
if (src->file->thread_handler) {
n = ngx_thread_read(&ctx->thread_task, src->file, dst->pos,
(size_t) size, src->file_pos, ctx->pool);
if (ctx->thread_handler) {
src->file->thread_task = ctx->thread_task;
src->file->thread_handler = ctx->thread_handler;
src->file->thread_ctx = ctx->filter_ctx;
n = ngx_thread_read(src->file, dst->pos, (size_t) size,
src->file_pos, ctx->pool);
if (n == NGX_AGAIN) {
ctx->thread_task = src->file->thread_task;
return NGX_AGAIN;
}

5
src/http/ngx_http_file_cache.c
View File

@ -691,12 +691,13 @@ ngx_http_file_cache_aio_read(ngx_http_request_t *r, ngx_http_cache_t *c)
#if (NGX_THREADS)
if (clcf->aio == NGX_HTTP_AIO_THREADS) {
c->file.thread_task = c->thread_task;
c->file.thread_handler = ngx_http_cache_thread_handler;
c->file.thread_ctx = r;
n = ngx_thread_read(&c->thread_task, &c->file, c->buf->pos,
c->body_start, 0, r->pool);
n = ngx_thread_read(&c->file, c->buf->pos, c->body_start, 0, r->pool);
c->thread_task = c->file.thread_task;
c->reading = (n == NGX_AGAIN);
return n;

8
src/os/unix/ngx_files.c
View File

@ -88,8 +88,8 @@ typedef struct {
ssize_t
ngx_thread_read(ngx_thread_task_t **taskp, ngx_file_t *file, u_char *buf,
size_t size, off_t offset, ngx_pool_t *pool)
ngx_thread_read(ngx_file_t *file, u_char *buf, size_t size, off_t offset,
ngx_pool_t *pool)
{
ngx_thread_task_t *task;
ngx_thread_read_ctx_t *ctx;
@ -98,7 +98,7 @@ ngx_thread_read(ngx_thread_task_t **taskp, ngx_file_t *file, u_char *buf,
"thread read: %d, %p, %uz, %O",
file->fd, buf, size, offset);
task = *taskp;
task = file->thread_task;
if (task == NULL) {
task = ngx_thread_task_alloc(pool, sizeof(ngx_thread_read_ctx_t));
@ -108,7 +108,7 @@ ngx_thread_read(ngx_thread_task_t **taskp, ngx_file_t *file, u_char *buf,
task->handler = ngx_thread_read_handler;
*taskp = task;
file->thread_task = task;
}
ctx = task->ctx;

4
src/os/unix/ngx_files.h
View File

@ -385,8 +385,8 @@ extern ngx_uint_t ngx_file_aio;
#endif
#if (NGX_THREADS)
ssize_t ngx_thread_read(ngx_thread_task_t **taskp, ngx_file_t *file,
u_char *buf, size_t size, off_t offset, ngx_pool_t *pool);
ssize_t ngx_thread_read(ngx_file_t *file, u_char *buf, size_t size,
off_t offset, ngx_pool_t *pool);
#endif