Port module-pipe-source to the new threaded design

git-svn-id: file:///home/lennart/svn/public/pulseaudio/branches/lennart@1484 fefdeb5f-60dc-0310-8127-8f9354f1896f

1 files changed, 187 insertions, 89 deletions

diff --git a/src/modules/module-pipe-source.c b/src/modules/module-pipe-source.c
index ac2bef7d..42224d52 100644
--- a/src/modules/module-pipe-source.c
+++ b/src/modules/module-pipe-source.c
@@ -28,22 +28,22 @@
 #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 "module-pipe-source-symdef.h"
 
@@ -58,18 +58,20 @@ 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_asyncmsgq *asyncmsgq;
+    
     char *filename;
+    int fd;
 
-    pa_source *source;
-    pa_iochannel *io;
-    pa_module *module;
-    pa_memchunk chunk;
+    pa_memchunk memchunk;
 };
 
 static const char* const valid_modargs[] = {
@@ -82,65 +84,146 @@ static const char* const valid_modargs[] = {
     NULL
 };
 
-static void do_read(struct userdata *u) {
-    ssize_t r;
-    void *p;
-    pa_memchunk chunk;
-
-    assert(u);
-
-    if (!pa_iochannel_is_readable(u->io))
-        return;
-
-    pa_module_set_used(u->module, pa_idxset_size(u->source->outputs));
-
-    if (!u->chunk.memblock) {
-        u->chunk.memblock = pa_memblock_new(u->core->mempool, PIPE_BUF);
-        u->chunk.index = chunk.length = 0;
-    }
-
-    assert(u->chunk.memblock);
-    assert(pa_memblock_get_length(u->chunk.memblock) > u->chunk.index);
-
-    p = pa_memblock_acquire(u->chunk.memblock);
-    if ((r = pa_iochannel_read(u->io, (uint8_t*) p + u->chunk.index, pa_memblock_get_length(u->chunk.memblock) - u->chunk.index)) <= 0) {
-        pa_memblock_release(u->chunk.memblock);
-        pa_log("read(): %s", pa_cstrerror(errno));
-        return;
+static void thread_func(void *userdata) {
+    enum {
+        POLLFD_ASYNCQ,
+        POLLFD_FIFO,
+        POLLFD_MAX,
+    };
+    
+    struct userdata *u = userdata;
+    struct pollfd pollfd[POLLFD_MAX];
+    int read_type = 0;
+
+    pa_assert(u);
+
+    pa_log_debug("Thread starting up");
+
+    pa_memchunk_reset(&u->memchunk);
+    
+    memset(&pollfd, 0, sizeof(pollfd));
+    
+    pollfd[POLLFD_ASYNCQ].fd = pa_asyncmsgq_get_fd(u->asyncmsgq);
+    pollfd[POLLFD_ASYNCQ].events = POLLIN;
+    pollfd[POLLFD_FIFO].fd = u->fd;
+
+    for (;;) {
+        pa_msgobject *object;
+        int code;
+        void *data;
+        pa_memchunk chunk;
+        int r;
+
+        /* Check whether there is a message for us to process */
+        if (pa_asyncmsgq_get(u->asyncmsgq, &object, &code, &data, &chunk, 0) == 0) {
+            int ret;
+
+            if (!object && code == PA_MESSAGE_SHUTDOWN) {
+                pa_asyncmsgq_done(u->asyncmsgq, 0);
+                goto finish;
+            }
+
+            ret = pa_asyncmsgq_dispatch(object, code, data, &chunk);
+            pa_asyncmsgq_done(u->asyncmsgq, ret);
+            continue;
+        }
+
+        /* Render some data and write it to the fifo */
+
+        if (u->source->thread_info.state == PA_SOURCE_RUNNING && pollfd[POLLFD_FIFO].revents) {
+            void *p;
+            ssize_t l;
+            
+            if (!u->memchunk.memblock) {
+                u->memchunk.memblock = pa_memblock_new(u->core->mempool, PIPE_BUF);
+                u->memchunk.index = u->memchunk.length = 0;
+            }
+
+            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[POLLFD_FIFO].revents = 0;
+                continue;
+            }
+        }
+
+        pollfd[POLLFD_FIFO].events = u->source->thread_info.state == PA_SINK_RUNNING ? POLLIN : 0;
+
+        /* Hmm, nothing to do. Let's sleep */
+
+        if (pa_asyncmsgq_before_poll(u->asyncmsgq) < 0)
+            continue;
+
+/*         pa_log("polling for %i", pollfd[POLLFD_FIFO].events); */
+        r = poll(pollfd, POLLFD_MAX, -1);
+/*         pa_log("polling got %i (r=%i) %i", r > 0 ? pollfd[POLLFD_FIFO].revents : 0, r, r > 0 ? pollfd[POLLFD_ASYNCQ].revents: 0); */
+
+        pa_asyncmsgq_after_poll(u->asyncmsgq);
+
+        if (r < 0) {
+            if (errno == EINTR)
+                continue;
+
+            pa_log("poll() failed: %s", pa_cstrerror(errno));
+            goto fail;
+        }
+
+        if (pollfd[POLLFD_FIFO].revents & ~POLLIN) {
+            pa_log("FIFO shutdown.");
+            goto fail;
+        }
+
+        pa_assert((pollfd[POLLFD_ASYNCQ].revents & ~POLLIN) == 0);
     }
-    pa_memblock_release(u->chunk.memblock);
-
-    u->chunk.length = r;
-    pa_source_post(u->source, &u->chunk);
-    u->chunk.index += r;
 
-    if (u->chunk.index >= pa_memblock_get_length(u->chunk.memblock)) {
-        u->chunk.index = u->chunk.length = 0;
-        pa_memblock_unref(u->chunk.memblock);
-        u->chunk.memblock = NULL;
-    }
-}
+fail:
+    /* We have to continue processing messages until we receive the
+     * SHUTDOWN message */
+    pa_asyncmsgq_post(u->core->asyncmsgq, PA_MSGOBJECT(u->core), PA_CORE_MESSAGE_UNLOAD_MODULE, u->module, NULL, NULL);
+    pa_asyncmsgq_wait_for(u->asyncmsgq, PA_MESSAGE_SHUTDOWN);
 
-static void io_callback(PA_GCC_UNUSED pa_iochannel *io, void*userdata) {
-    struct userdata *u = userdata;
-    assert(u);
-    do_read(u);
+finish:
+    pa_log_debug("Thread shutting down");
 }
 
 int pa__init(pa_core *c, pa_module*m) {
-    struct userdata *u = NULL;
+    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;
 
-    assert(c && m);
+    pa_assert(c);
+    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;
     }
 
@@ -150,48 +233,50 @@ int pa__init(pa_core *c, pa_module*m) {
         goto fail;
     }
 
-    mkfifo(p = pa_modargs_get_value(ma, "file", DEFAULT_FIFO_NAME), 0777);
+    u = pa_xnew0(struct userdata, 1);
+    u->core = c;
+    u->module = m;
+    m->userdata = u;
 
-    if ((fd = open(p, O_RDWR)) < 0) {
-        pa_log("open('%s'): %s", p, pa_cstrerror(errno));
+    pa_assert_se(u->asyncmsgq = pa_asyncmsgq_new(0));
+
+    u->filename = pa_xstrdup(pa_modargs_get_value(ma, "file", DEFAULT_FILE_NAME));
+    
+    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_fd_set_cloexec(u->fd, 1);
+    pa_make_nonblock_fd(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.");
+        pa_log("Failed to create source.");
         goto fail;
     }
+
     u->source->userdata = u;
+    
     pa_source_set_module(u->source, m);
-    pa_source_set_description(u->source, t = pa_sprintf_malloc("Unix FIFO source '%s'", p));
+    pa_source_set_asyncmsgq(u->source, u->asyncmsgq);
+    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->chunk.memblock = NULL;
-    u->chunk.index = u->chunk.length = 0;
-
-    u->module = m;
-    m->userdata = u;
+    if (!(u->thread = pa_thread_new(thread_func, u))) {
+        pa_log("Failed to create thread.");
+        goto fail;
+    }
 
     pa_modargs_free(ma);
 
@@ -201,9 +286,6 @@ fail:
     if (ma)
         pa_modargs_free(ma);
 
-    if (fd >= 0)
-        close(fd);
-
     pa__done(c, m);
 
     return -1;
@@ -211,21 +293,37 @@ fail:
 
 void pa__done(pa_core *c, pa_module*m) {
     struct userdata *u;
-    assert(c && m);
+    
+    pa_assert(c);
+    pa_assert(m);
 
     if (!(u = m->userdata))
         return;
 
-    if (u->chunk.memblock)
-        pa_memblock_unref(u->chunk.memblock);
+    if (u->source)
+        pa_source_disconnect(u->source);
 
-    pa_source_disconnect(u->source);
-    pa_source_unref(u->source);
-    pa_iochannel_free(u->io);
+    if (u->thread) {
+        pa_asyncmsgq_send(u->asyncmsgq, NULL, PA_MESSAGE_SHUTDOWN, NULL, NULL);
+        pa_thread_free(u->thread);
+    }
+
+    if (u->asyncmsgq)
+        pa_asyncmsgq_free(u->asyncmsgq);
+
+    if (u->source)
+        pa_source_unref(u->source);
+    
+    if (u->memchunk.memblock)
+        pa_memblock_unref(u->memchunk.memblock);
+
+    if (u->filename) {
+        unlink(u->filename);
+        pa_xfree(u->filename);
+    }
 
-    assert(u->filename);
-    unlink(u->filename);
-    pa_xfree(u->filename);
+    if (u->fd >= 0)
+        close(u->fd);
 
     pa_xfree(u);
 }