From 2dd5bc6a074165ddfbd57c4bd52c2d2dac8f47a1 Mon Sep 17 00:00:00 2001 From: Daniel Baumann Date: Sat, 27 Apr 2024 18:03:18 +0200 Subject: Adding upstream version 14.2. Signed-off-by: Daniel Baumann --- src/pulsecore/asyncmsgq.c | 358 ++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 358 insertions(+) create mode 100644 src/pulsecore/asyncmsgq.c (limited to 'src/pulsecore/asyncmsgq.c') diff --git a/src/pulsecore/asyncmsgq.c b/src/pulsecore/asyncmsgq.c new file mode 100644 index 0000000..47371ae --- /dev/null +++ b/src/pulsecore/asyncmsgq.c @@ -0,0 +1,358 @@ +/*** + This file is part of PulseAudio. + + Copyright 2006 Lennart Poettering + + PulseAudio is free software; you can redistribute it and/or modify + it under the terms of the GNU Lesser General Public License as + published by the Free Software Foundation; either version 2.1 of the + License, or (at your option) any later version. + + PulseAudio is distributed in the hope that it will be useful, but + WITHOUT ANY WARRANTY; without even the implied warranty of + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + Lesser General Public License for more details. + + You should have received a copy of the GNU Lesser General Public + License along with PulseAudio; if not, see . +***/ + +#ifdef HAVE_CONFIG_H +#include +#endif + +#include +#include + +#include + +#include +#include +#include +#include +#include +#include + +#include "asyncmsgq.h" + +PA_STATIC_FLIST_DECLARE(asyncmsgq, 0, pa_xfree); +PA_STATIC_FLIST_DECLARE(semaphores, 0, (void(*)(void*)) pa_semaphore_free); + +struct asyncmsgq_item { + int code; + pa_msgobject *object; + void *userdata; + pa_free_cb_t free_cb; + int64_t offset; + pa_memchunk memchunk; + pa_semaphore *semaphore; + int ret; +}; + +struct pa_asyncmsgq { + PA_REFCNT_DECLARE; + pa_asyncq *asyncq; + pa_mutex *mutex; /* only for the writer side */ + + struct asyncmsgq_item *current; +}; + +pa_asyncmsgq *pa_asyncmsgq_new(unsigned size) { + pa_asyncq *asyncq; + pa_asyncmsgq *a; + + asyncq = pa_asyncq_new(size); + if (!asyncq) + return NULL; + + a = pa_xnew(pa_asyncmsgq, 1); + + PA_REFCNT_INIT(a); + a->asyncq = asyncq; + pa_assert_se(a->mutex = pa_mutex_new(false, true)); + a->current = NULL; + + return a; +} + +static void asyncmsgq_free(pa_asyncmsgq *a) { + struct asyncmsgq_item *i; + pa_assert(a); + + while ((i = pa_asyncq_pop(a->asyncq, false))) { + + pa_assert(!i->semaphore); + + if (i->object) + pa_msgobject_unref(i->object); + + if (i->memchunk.memblock) + pa_memblock_unref(i->memchunk.memblock); + + if (i->free_cb) + i->free_cb(i->userdata); + + if (pa_flist_push(PA_STATIC_FLIST_GET(asyncmsgq), i) < 0) + pa_xfree(i); + } + + pa_asyncq_free(a->asyncq, NULL); + pa_mutex_free(a->mutex); + pa_xfree(a); +} + +pa_asyncmsgq* pa_asyncmsgq_ref(pa_asyncmsgq *q) { + pa_assert(PA_REFCNT_VALUE(q) > 0); + + PA_REFCNT_INC(q); + return q; +} + +void pa_asyncmsgq_unref(pa_asyncmsgq* q) { + pa_assert(PA_REFCNT_VALUE(q) > 0); + + if (PA_REFCNT_DEC(q) <= 0) + asyncmsgq_free(q); +} + +void pa_asyncmsgq_post(pa_asyncmsgq *a, pa_msgobject *object, int code, const void *userdata, int64_t offset, const pa_memchunk *chunk, pa_free_cb_t free_cb) { + struct asyncmsgq_item *i; + pa_assert(PA_REFCNT_VALUE(a) > 0); + + if (!(i = pa_flist_pop(PA_STATIC_FLIST_GET(asyncmsgq)))) + i = pa_xnew(struct asyncmsgq_item, 1); + + i->code = code; + i->object = object ? pa_msgobject_ref(object) : NULL; + i->userdata = (void*) userdata; + i->free_cb = free_cb; + i->offset = offset; + if (chunk) { + pa_assert(chunk->memblock); + i->memchunk = *chunk; + pa_memblock_ref(i->memchunk.memblock); + } else + pa_memchunk_reset(&i->memchunk); + i->semaphore = NULL; + + /* This mutex makes the queue multiple-writer safe. This lock is only used on the writing side */ + pa_mutex_lock(a->mutex); + pa_asyncq_post(a->asyncq, i); + pa_mutex_unlock(a->mutex); +} + +int pa_asyncmsgq_send(pa_asyncmsgq *a, pa_msgobject *object, int code, const void *userdata, int64_t offset, const pa_memchunk *chunk) { + struct asyncmsgq_item i; + pa_assert(PA_REFCNT_VALUE(a) > 0); + + i.code = code; + i.object = object; + i.userdata = (void*) userdata; + i.free_cb = NULL; + i.ret = -1; + i.offset = offset; + if (chunk) { + pa_assert(chunk->memblock); + i.memchunk = *chunk; + } else + pa_memchunk_reset(&i.memchunk); + + if (!(i.semaphore = pa_flist_pop(PA_STATIC_FLIST_GET(semaphores)))) + i.semaphore = pa_semaphore_new(0); + + /* This mutex makes the queue multiple-writer safe. This lock is only used on the writing side */ + pa_mutex_lock(a->mutex); + pa_assert_se(pa_asyncq_push(a->asyncq, &i, true) == 0); + pa_mutex_unlock(a->mutex); + + pa_semaphore_wait(i.semaphore); + + if (pa_flist_push(PA_STATIC_FLIST_GET(semaphores), i.semaphore) < 0) + pa_semaphore_free(i.semaphore); + + return i.ret; +} + +int pa_asyncmsgq_get(pa_asyncmsgq *a, pa_msgobject **object, int *code, void **userdata, int64_t *offset, pa_memchunk *chunk, bool wait_op) { + pa_assert(PA_REFCNT_VALUE(a) > 0); + pa_assert(!a->current); + + if (!(a->current = pa_asyncq_pop(a->asyncq, wait_op))) { +/* pa_log("failure"); */ + return -1; + } + +/* pa_log("success"); */ + + if (code) + *code = a->current->code; + if (userdata) + *userdata = a->current->userdata; + if (offset) + *offset = a->current->offset; + if (object) { + if ((*object = a->current->object)) + pa_msgobject_assert_ref(*object); + } + if (chunk) + *chunk = a->current->memchunk; + +/* pa_log_debug("Get q=%p object=%p (%s) code=%i data=%p chunk.length=%lu", */ +/* (void*) a, */ +/* (void*) a->current->object, */ +/* a->current->object ? a->current->object->parent.type_name : NULL, */ +/* a->current->code, */ +/* (void*) a->current->userdata, */ +/* (unsigned long) a->current->memchunk.length); */ + + return 0; +} + +void pa_asyncmsgq_done(pa_asyncmsgq *a, int ret) { + pa_assert(PA_REFCNT_VALUE(a) > 0); + pa_assert(a); + pa_assert(a->current); + + if (a->current->semaphore) { + a->current->ret = ret; + pa_semaphore_post(a->current->semaphore); + } else { + + if (a->current->free_cb) + a->current->free_cb(a->current->userdata); + + if (a->current->object) + pa_msgobject_unref(a->current->object); + + if (a->current->memchunk.memblock) + pa_memblock_unref(a->current->memchunk.memblock); + + if (pa_flist_push(PA_STATIC_FLIST_GET(asyncmsgq), a->current) < 0) + pa_xfree(a->current); + } + + a->current = NULL; +} + +int pa_asyncmsgq_wait_for(pa_asyncmsgq *a, int code) { + int c; + pa_assert(PA_REFCNT_VALUE(a) > 0); + + pa_asyncmsgq_ref(a); + + do { + pa_msgobject *o; + void *data; + int64_t offset; + pa_memchunk chunk; + int ret; + + if (pa_asyncmsgq_get(a, &o, &c, &data, &offset, &chunk, true) < 0) + return -1; + + ret = pa_asyncmsgq_dispatch(o, c, data, offset, &chunk); + pa_asyncmsgq_done(a, ret); + + } while (c != code); + + pa_asyncmsgq_unref(a); + + return 0; +} + +int pa_asyncmsgq_process_one(pa_asyncmsgq *a) { + pa_msgobject *object; + int code; + void *data; + pa_memchunk chunk; + int64_t offset; + int ret; + + pa_assert(PA_REFCNT_VALUE(a) > 0); + + if (pa_asyncmsgq_get(a, &object, &code, &data, &offset, &chunk, false) < 0) + return 0; + + pa_asyncmsgq_ref(a); + ret = pa_asyncmsgq_dispatch(object, code, data, offset, &chunk); + pa_asyncmsgq_done(a, ret); + pa_asyncmsgq_unref(a); + + return 1; +} + +int pa_asyncmsgq_read_fd(pa_asyncmsgq *a) { + pa_assert(PA_REFCNT_VALUE(a) > 0); + + return pa_asyncq_read_fd(a->asyncq); +} + +int pa_asyncmsgq_read_before_poll(pa_asyncmsgq *a) { + pa_assert(PA_REFCNT_VALUE(a) > 0); + + return pa_asyncq_read_before_poll(a->asyncq); +} + +void pa_asyncmsgq_read_after_poll(pa_asyncmsgq *a) { + pa_assert(PA_REFCNT_VALUE(a) > 0); + + pa_asyncq_read_after_poll(a->asyncq); +} + +int pa_asyncmsgq_write_fd(pa_asyncmsgq *a) { + pa_assert(PA_REFCNT_VALUE(a) > 0); + + return pa_asyncq_write_fd(a->asyncq); +} + +void pa_asyncmsgq_write_before_poll(pa_asyncmsgq *a) { + pa_assert(PA_REFCNT_VALUE(a) > 0); + + pa_asyncq_write_before_poll(a->asyncq); +} + +void pa_asyncmsgq_write_after_poll(pa_asyncmsgq *a) { + pa_assert(PA_REFCNT_VALUE(a) > 0); + + pa_asyncq_write_after_poll(a->asyncq); +} + +int pa_asyncmsgq_dispatch(pa_msgobject *object, int code, void *userdata, int64_t offset, pa_memchunk *memchunk) { + + if (object) + return object->process_msg(object, code, userdata, offset, pa_memchunk_isset(memchunk) ? memchunk : NULL); + + return 0; +} + +void pa_asyncmsgq_flush(pa_asyncmsgq *a, bool run) { + pa_assert(PA_REFCNT_VALUE(a) > 0); + + for (;;) { + pa_msgobject *object; + int code; + void *data; + int64_t offset; + pa_memchunk chunk; + int ret; + + if (pa_asyncmsgq_get(a, &object, &code, &data, &offset, &chunk, false) < 0) + return; + + if (!run) { + pa_asyncmsgq_done(a, -1); + continue; + } + + pa_asyncmsgq_ref(a); + ret = pa_asyncmsgq_dispatch(object, code, data, offset, &chunk); + pa_asyncmsgq_done(a, ret); + pa_asyncmsgq_unref(a); + } +} + +bool pa_asyncmsgq_dispatching(pa_asyncmsgq *a) { + pa_assert(PA_REFCNT_VALUE(a) > 0); + + return !!a->current; +} -- cgit v1.2.3