From a67c21f093202f142438689d3f7cfbdf4ea82eea Mon Sep 17 00:00:00 2001
From: Lennart Poettering <lennart@poettering.net>
Date: Sun, 28 Oct 2007 19:13:50 +0000
Subject: merge 'lennart' branch back into trunk.

git-svn-id: file:///home/lennart/svn/public/pulseaudio/trunk@1971 fefdeb5f-60dc-0310-8127-8f9354f1896f
---
 src/modules/module-pipe-source.c | 244 ++++++++++++++++++++++++++-------------
 1 file changed, 164 insertions(+), 80 deletions(-)

(limited to 'src/modules/module-pipe-source.c')

diff --git a/src/modules/module-pipe-source.c b/src/modules/module-pipe-source.c
index 56c721b0..45708c68 100644
--- a/src/modules/module-pipe-source.c
+++ b/src/modules/module-pipe-source.c
@@ -28,22 +28,24 @@
 #include <stdlib.h>
 #include <sys/stat.h>
 #include <stdio.h>
-#include <assert.h>
 #include <errno.h>
 #include <string.h>
 #include <fcntl.h>
 #include <unistd.h>
 #include <limits.h>
+#include <sys/poll.h>
 
 #include <pulse/xmalloc.h>
 
 #include <pulsecore/core-error.h>
-#include <pulsecore/iochannel.h>
 #include <pulsecore/source.h>
 #include <pulsecore/module.h>
 #include <pulsecore/core-util.h>
 #include <pulsecore/modargs.h>
 #include <pulsecore/log.h>
+#include <pulsecore/thread.h>
+#include <pulsecore/thread-mq.h>
+#include <pulsecore/rtpoll.h>
 
 #include "module-pipe-source-symdef.h"
 
@@ -58,18 +60,24 @@ PA_MODULE_USAGE(
         "rate=<sample rate> "
         "channel_map=<channel map>")
 
-#define DEFAULT_FIFO_NAME "/tmp/music.input"
+#define DEFAULT_FILE_NAME "/tmp/music.input"
 #define DEFAULT_SOURCE_NAME "fifo_input"
 
 struct userdata {
     pa_core *core;
+    pa_module *module;
+    pa_source *source;
+
+    pa_thread *thread;
+    pa_thread_mq thread_mq;
+    pa_rtpoll *rtpoll;
 
     char *filename;
+    int fd;
 
-    pa_source *source;
-    pa_iochannel *io;
-    pa_module *module;
-    pa_memchunk chunk;
+    pa_memchunk memchunk;
+
+    pa_rtpoll_item *rtpoll_item;
 };
 
 static const char* const valid_modargs[] = {
@@ -82,109 +90,168 @@ static const char* const valid_modargs[] = {
     NULL
 };
 
-static void do_read(struct userdata *u) {
-    ssize_t r;
-    pa_memchunk chunk;
-    assert(u);
+static void thread_func(void *userdata) {
+    struct userdata *u = userdata;
+    int read_type = 0;
 
-    if (!pa_iochannel_is_readable(u->io))
-        return;
+    pa_assert(u);
 
-    pa_module_set_used(u->module, pa_idxset_size(u->source->outputs));
+    pa_log_debug("Thread starting up");
 
-    if (!u->chunk.memblock) {
-        u->chunk.memblock = pa_memblock_new(u->core->mempool, PIPE_BUF);
-        u->chunk.index = chunk.length = 0;
-    }
+    pa_thread_mq_install(&u->thread_mq);
+    pa_rtpoll_install(u->rtpoll);
 
-    assert(u->chunk.memblock && u->chunk.memblock->length > u->chunk.index);
-    if ((r = pa_iochannel_read(u->io, (uint8_t*) u->chunk.memblock->data + u->chunk.index, u->chunk.memblock->length - u->chunk.index)) <= 0) {
-        pa_log("read(): %s", pa_cstrerror(errno));
-        return;
-    }
+    for (;;) {
+        int ret;
+        struct pollfd *pollfd;
+
+        pollfd = pa_rtpoll_item_get_pollfd(u->rtpoll_item, NULL);
+
+        /* Try to read some data and pass it on to the source driver */
+        if (u->source->thread_info.state == PA_SOURCE_RUNNING && pollfd->revents) {
+            ssize_t l;
+            void *p;
 
-    u->chunk.length = r;
-    pa_source_post(u->source, &u->chunk);
-    u->chunk.index += r;
+            if (!u->memchunk.memblock) {
+                u->memchunk.memblock = pa_memblock_new(u->core->mempool, PIPE_BUF);
+                u->memchunk.index = u->memchunk.length = 0;
+            }
 
-    if (u->chunk.index >= u->chunk.memblock->length) {
-        u->chunk.index = u->chunk.length = 0;
-        pa_memblock_unref(u->chunk.memblock);
-        u->chunk.memblock = NULL;
+            pa_assert(pa_memblock_get_length(u->memchunk.memblock) > u->memchunk.index);
+
+            p = pa_memblock_acquire(u->memchunk.memblock);
+            l = pa_read(u->fd, (uint8_t*) p + u->memchunk.index, pa_memblock_get_length(u->memchunk.memblock) - u->memchunk.index, &read_type);
+            pa_memblock_release(u->memchunk.memblock);
+
+            pa_assert(l != 0); /* EOF cannot happen, since we opened the fifo for both reading and writing */
+
+            if (l < 0) {
+
+                if (errno == EINTR)
+                    continue;
+                else if (errno != EAGAIN) {
+                    pa_log("Faile to read data from FIFO: %s", pa_cstrerror(errno));
+                    goto fail;
+                }
+
+            } else {
+
+                u->memchunk.length = l;
+                pa_source_post(u->source, &u->memchunk);
+                u->memchunk.index += l;
+
+                if (u->memchunk.index >= pa_memblock_get_length(u->memchunk.memblock)) {
+                    pa_memblock_unref(u->memchunk.memblock);
+                    pa_memchunk_reset(&u->memchunk);
+                }
+
+                pollfd->revents = 0;
+            }
+        }
+
+        /* Hmm, nothing to do. Let's sleep */
+        pollfd->events = u->source->thread_info.state == PA_SOURCE_RUNNING ? POLLIN : 0;
+
+        if ((ret = pa_rtpoll_run(u->rtpoll, 1)) < 0)
+            goto fail;
+
+        if (ret == 0)
+            goto finish;
+
+        pollfd = pa_rtpoll_item_get_pollfd(u->rtpoll_item, NULL);
+        if (pollfd->revents & ~POLLIN) {
+            pa_log("FIFO shutdown.");
+            goto fail;
+        }
     }
-}
 
-static void io_callback(PA_GCC_UNUSED pa_iochannel *io, void*userdata) {
-    struct userdata *u = userdata;
-    assert(u);
-    do_read(u);
+fail:
+    /* If this was no regular exit from the loop we have to continue
+     * processing messages until we received PA_MESSAGE_SHUTDOWN */
+    pa_asyncmsgq_post(u->thread_mq.outq, PA_MSGOBJECT(u->core), PA_CORE_MESSAGE_UNLOAD_MODULE, u->module, 0, NULL, NULL);
+    pa_asyncmsgq_wait_for(u->thread_mq.inq, PA_MESSAGE_SHUTDOWN);
+
+finish:
+    pa_log_debug("Thread shutting down");
 }
 
-int pa__init(pa_core *c, pa_module*m) {
-    struct userdata *u = NULL;
+int pa__init(pa_module*m) {
+    struct userdata *u;
     struct stat st;
-    const char *p;
-    int fd = -1;
     pa_sample_spec ss;
     pa_channel_map map;
-    pa_modargs *ma = NULL;
+    pa_modargs *ma;
     char *t;
+    struct pollfd *pollfd;
 
-    assert(c && m);
+    pa_assert(m);
 
     if (!(ma = pa_modargs_new(m->argument, valid_modargs))) {
-        pa_log("failed to parse module arguments");
+        pa_log("failed to parse module arguments.");
         goto fail;
     }
 
-    ss = c->default_sample_spec;
+    ss = m->core->default_sample_spec;
     if (pa_modargs_get_sample_spec_and_channel_map(ma, &ss, &map, PA_CHANNEL_MAP_DEFAULT) < 0) {
         pa_log("invalid sample format specification or channel map");
         goto fail;
     }
 
-    mkfifo(p = pa_modargs_get_value(ma, "file", DEFAULT_FIFO_NAME), 0777);
+    u = pa_xnew0(struct userdata, 1);
+    u->core = m->core;
+    u->module = m;
+    m->userdata = u;
+    pa_memchunk_reset(&u->memchunk);
+    pa_thread_mq_init(&u->thread_mq, m->core->mainloop);
+    u->rtpoll = pa_rtpoll_new();
+    pa_rtpoll_item_new_asyncmsgq(u->rtpoll, PA_RTPOLL_EARLY, u->thread_mq.inq);
+
+    u->filename = pa_xstrdup(pa_modargs_get_value(ma, "file", DEFAULT_FILE_NAME));
 
-    if ((fd = open(p, O_RDWR)) < 0) {
-        pa_log("open('%s'): %s", p, pa_cstrerror(errno));
+    mkfifo(u->filename, 0666);
+    if ((u->fd = open(u->filename, O_RDWR|O_NOCTTY)) < 0) {
+        pa_log("open('%s'): %s", u->filename, pa_cstrerror(errno));
         goto fail;
     }
 
-    pa_fd_set_cloexec(fd, 1);
+    pa_make_fd_cloexec(u->fd);
+    pa_make_fd_nonblock(u->fd);
 
-    if (fstat(fd, &st) < 0) {
-        pa_log("fstat('%s'): %s", p, pa_cstrerror(errno));
+    if (fstat(u->fd, &st) < 0) {
+        pa_log("fstat('%s'): %s",u->filename, pa_cstrerror(errno));
         goto fail;
     }
 
     if (!S_ISFIFO(st.st_mode)) {
-        pa_log("'%s' is not a FIFO.", p);
+        pa_log("'%s' is not a FIFO.", u->filename);
         goto fail;
     }
 
-    u = pa_xmalloc0(sizeof(struct userdata));
-
-    u->filename = pa_xstrdup(p);
-    u->core = c;
-
-    if (!(u->source = pa_source_new(c, __FILE__, pa_modargs_get_value(ma, "source_name", DEFAULT_SOURCE_NAME), 0, &ss, &map))) {
-        pa_log("failed to create source.");
+    if (!(u->source = pa_source_new(m->core, __FILE__, pa_modargs_get_value(ma, "source_name", DEFAULT_SOURCE_NAME), 0, &ss, &map))) {
+        pa_log("Failed to create source.");
         goto fail;
     }
+
     u->source->userdata = u;
-    pa_source_set_owner(u->source, m);
-    pa_source_set_description(u->source, t = pa_sprintf_malloc("Unix FIFO source '%s'", p));
+    u->source->flags = 0;
+
+    pa_source_set_module(u->source, m);
+    pa_source_set_asyncmsgq(u->source, u->thread_mq.inq);
+    pa_source_set_rtpoll(u->source, u->rtpoll);
+    pa_source_set_description(u->source, t = pa_sprintf_malloc("Unix FIFO source '%s'", u->filename));
     pa_xfree(t);
 
-    u->io = pa_iochannel_new(c->mainloop, fd, -1);
-    assert(u->io);
-    pa_iochannel_set_callback(u->io, io_callback, u);
+    u->rtpoll_item = pa_rtpoll_item_new(u->rtpoll, PA_RTPOLL_NEVER, 1);
+    pollfd = pa_rtpoll_item_get_pollfd(u->rtpoll_item, NULL);
+    pollfd->fd = u->fd;
+    pollfd->events = pollfd->revents = 0;
 
-    u->chunk.memblock = NULL;
-    u->chunk.index = u->chunk.length = 0;
+    if (!(u->thread = pa_thread_new(thread_func, u))) {
+        pa_log("Failed to create thread.");
+        goto fail;
+    }
 
-    u->module = m;
-    m->userdata = u;
+    pa_source_put(u->source);
 
     pa_modargs_free(ma);
 
@@ -194,31 +261,48 @@ fail:
     if (ma)
         pa_modargs_free(ma);
 
-    if (fd >= 0)
-        close(fd);
-
-    pa__done(c, m);
+    pa__done(m);
 
     return -1;
 }
 
-void pa__done(pa_core *c, pa_module*m) {
+void pa__done(pa_module*m) {
     struct userdata *u;
-    assert(c && m);
+
+    pa_assert(m);
 
     if (!(u = m->userdata))
         return;
 
-    if (u->chunk.memblock)
-        pa_memblock_unref(u->chunk.memblock);
+    if (u->source)
+        pa_source_unlink(u->source);
+
+    if (u->thread) {
+        pa_asyncmsgq_send(u->thread_mq.inq, NULL, PA_MESSAGE_SHUTDOWN, NULL, 0, NULL);
+        pa_thread_free(u->thread);
+    }
+
+    pa_thread_mq_done(&u->thread_mq);
+
+    if (u->source)
+        pa_source_unref(u->source);
+
+    if (u->memchunk.memblock)
+        pa_memblock_unref(u->memchunk.memblock);
 
-    pa_source_disconnect(u->source);
-    pa_source_unref(u->source);
-    pa_iochannel_free(u->io);
+    if (u->rtpoll_item)
+        pa_rtpoll_item_free(u->rtpoll_item);
+
+    if (u->rtpoll)
+        pa_rtpoll_free(u->rtpoll);
+
+    if (u->filename) {
+        unlink(u->filename);
+        pa_xfree(u->filename);
+    }
 
-    assert(u->filename);
-    unlink(u->filename);
-    pa_xfree(u->filename);
+    if (u->fd >= 0)
+        pa_assert_se(pa_close(u->fd) == 0);
 
     pa_xfree(u);
 }
-- 
cgit