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Diffstat (limited to 'src/modules/module-rt.c')
| -rw-r--r-- | src/modules/module-rt.c | 1095 |
1 files changed, 1095 insertions, 0 deletions
diff --git a/src/modules/module-rt.c b/src/modules/module-rt.c new file mode 100644 index 0000000..f6b4ade --- /dev/null +++ b/src/modules/module-rt.c @@ -0,0 +1,1095 @@ +/* PipeWire + * + * Copyright © 2022 Wim Taymans + * + * Permission is hereby granted, free of charge, to any person obtaining a + * copy of this software and associated documentation files (the "Software"), + * to deal in the Software without restriction, including without limitation + * the rights to use, copy, modify, merge, publish, distribute, sublicense, + * and/or sell copies of the Software, and to permit persons to whom the + * Software is furnished to do so, subject to the following conditions: + * + * The above copyright notice and this permission notice (including the next + * paragraph) shall be included in all copies or substantial portions of the + * Software. + * + * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR + * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, + * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL + * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER + * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING + * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER + * DEALINGS IN THE SOFTWARE. + */ +/*** + Copyright 2009 Lennart Poettering + Copyright 2010 David Henningsson <diwic@ubuntu.com> + + Permission is hereby granted, free of charge, to any person + obtaining a copy of this software and associated documentation files + (the "Software"), to deal in the Software without restriction, + including without limitation the rights to use, copy, modify, merge, + publish, distribute, sublicense, and/or sell copies of the Software, + and to permit persons to whom the Software is furnished to do so, + subject to the following conditions: + + The above copyright notice and this permission notice shall be + included in all copies or substantial portions of the Software. + + THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, + EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF + MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND + NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS + BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN + ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN + CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE + SOFTWARE. +***/ + +#include <stdlib.h> +#include <stdbool.h> +#include <string.h> +#include <stdio.h> +#include <errno.h> +#include <sys/stat.h> +#if defined(__FreeBSD__) || defined(__MidnightBSD__) +#include <sys/thr.h> +#endif +#include <fcntl.h> +#include <unistd.h> +#include <pthread.h> +#include <sys/resource.h> +#include <sys/syscall.h> + +#include "config.h" + +#include <spa/utils/result.h> +#include <spa/utils/string.h> + +#include <pipewire/impl.h> +#include <pipewire/thread.h> + +#ifdef HAVE_DBUS +#include <spa/support/dbus.h> +#include <dbus/dbus.h> +#endif + +/** \page page_module_rt PipeWire Module: RT + * + * The `rt` modules can give real-time priorities to processing threads. + * + * It uses the operating system's scheduler to enable realtime scheduling + * for certain threads to assist with low latency audio processing. + * This requires `RLIMIT_RTPRIO` to be set to a value that's equal to this + * module's `rt.prio` parameter or higher. Most distros will come with some + * package that configures this for certain groups or users. If this is not set + * up and DBus is available, then this module will fall back to using RTKit. + * + * ## Module Options + * + * - `nice.level`: The nice value set for the application thread. It improves + * performance of the communication with the pipewire daemon. + * - `rt.prio`: The realtime priority of the data thread. Higher values are + * higher priority. + * - `rt.time.soft`, `rt.time.hard`: The amount of CPU time an RT thread can + * consume without doing any blocking calls before the kernel kills + * the thread. This is a safety measure to avoid lockups of the complete + * system when some thread consumes 100%. + + * The nice level is by default set to an invalid value so that clients don't + * automatically have the nice level raised. + * + * The PipeWire server processes are explicitly configured with a valid nice level. + * + * ## Example configuration + * + *\code{.unparsed} + * context.modules = [ + * { name = libpipewire-module-rt + * args = { + * #nice.level = 20 + * #rt.prio = 88 + * #rt.time.soft = -1 + * #rt.time.hard = -1 + * } + * flags = [ ifexists nofail ] + * } + * ] + *\endcode + */ + +#define NAME "rt" + +PW_LOG_TOPIC_STATIC(mod_topic, "mod." NAME); +#define PW_LOG_TOPIC_DEFAULT mod_topic + +#define REALTIME_POLICY SCHED_FIFO +#ifdef SCHED_RESET_ON_FORK +#define PW_SCHED_RESET_ON_FORK SCHED_RESET_ON_FORK +#else +/* FreeBSD compat */ +#define PW_SCHED_RESET_ON_FORK 0 +#endif + +#define IS_VALID_NICE_LEVEL(l) ((l)>=-20 && (l)<=19) + +#define DEFAULT_NICE_LEVEL 20 +#define DEFAULT_RT_PRIO_MIN 11 +#define DEFAULT_RT_PRIO 88 +#define DEFAULT_RT_TIME_SOFT -1 +#define DEFAULT_RT_TIME_HARD -1 + +#define MODULE_USAGE "[nice.level=<priority: default "SPA_STRINGIFY(DEFAULT_NICE_LEVEL)"(don't change)>] " \ + "[rt.prio=<priority: default "SPA_STRINGIFY(DEFAULT_RT_PRIO)">] " \ + "[rt.time.soft=<in usec: default "SPA_STRINGIFY(DEFAULT_RT_TIME_SOFT)"] " \ + "[rt.time.hard=<in usec: default "SPA_STRINGIFY(DEFAULT_RT_TIME_HARD)"] " + +static const struct spa_dict_item module_props[] = { + { PW_KEY_MODULE_AUTHOR, "Wim Taymans <wim.taymans@gmail.com>" }, + { PW_KEY_MODULE_DESCRIPTION, "Use realtime thread scheduling, falling back to RTKit" }, + { PW_KEY_MODULE_USAGE, MODULE_USAGE }, + { PW_KEY_MODULE_VERSION, PACKAGE_VERSION }, +}; + +#ifdef HAVE_DBUS +#define RTKIT_SERVICE_NAME "org.freedesktop.RealtimeKit1" +#define RTKIT_OBJECT_PATH "/org/freedesktop/RealtimeKit1" +#define RTKIT_INTERFACE "org.freedesktop.RealtimeKit1" + +#define XDG_PORTAL_SERVICE_NAME "org.freedesktop.portal.Desktop" +#define XDG_PORTAL_OBJECT_PATH "/org/freedesktop/portal/desktop" +#define XDG_PORTAL_INTERFACE "org.freedesktop.portal.Realtime" + +/** \cond */ +struct pw_rtkit_bus { + DBusConnection *bus; +}; +/** \endcond */ + +struct thread { + struct impl *impl; + struct spa_list link; + pthread_t thread; + pid_t pid; + void *(*start)(void*); + void *arg; +}; +#endif /* HAVE_DBUS */ + +struct impl { + struct pw_context *context; + + struct spa_thread_utils thread_utils; + + int nice_level; + int rt_prio; + rlim_t rt_time_soft; + rlim_t rt_time_hard; + + struct spa_hook module_listener; + +#ifdef HAVE_DBUS + bool use_rtkit; + /* For D-Bus. These are const static. */ + const char* service_name; + const char* object_path; + const char* interface; + struct pw_rtkit_bus *rtkit_bus; + + /* These are only for the RTKit implementation to fill in the `thread` + * struct. Since there's barely any overhead here we'll do this + * regardless of which backend is used. */ + pthread_mutex_t lock; + pthread_cond_t cond; + struct spa_list threads_list; +#endif +}; + +#ifndef RLIMIT_RTTIME +#define RLIMIT_RTTIME 15 +#endif + +static pid_t _gettid(void) +{ +#if defined(HAVE_GETTID) + return (pid_t) gettid(); +#elif defined(__linux__) + return syscall(SYS_gettid); +#elif defined(__FreeBSD__) || defined(__MidnightBSD__) + long pid; + thr_self(&pid); + return (pid_t)pid; +#else +#error "No gettid impl" +#endif +} + +#ifdef HAVE_DBUS +struct pw_rtkit_bus *pw_rtkit_bus_get(DBusBusType bus_type) +{ + struct pw_rtkit_bus *bus; + DBusError error; + + if (getenv("DISABLE_RTKIT")) { + errno = ENOTSUP; + return NULL; + } + + dbus_error_init(&error); + + bus = calloc(1, sizeof(struct pw_rtkit_bus)); + if (bus == NULL) + return NULL; + + bus->bus = dbus_bus_get_private(bus_type, &error); + if (bus->bus == NULL) + goto error; + + dbus_connection_set_exit_on_disconnect(bus->bus, false); + + return bus; + +error: + free(bus); + pw_log_error("Failed to connect to %s bus: %s", + bus_type == DBUS_BUS_SYSTEM ? "system" : "session", error.message); + dbus_error_free(&error); + errno = ECONNREFUSED; + return NULL; +} + +struct pw_rtkit_bus *pw_rtkit_bus_get_system(void) +{ + return pw_rtkit_bus_get(DBUS_BUS_SYSTEM); +} + +struct pw_rtkit_bus *pw_rtkit_bus_get_session(void) +{ + return pw_rtkit_bus_get(DBUS_BUS_SESSION); +} + +bool pw_rtkit_check_xdg_portal(struct pw_rtkit_bus *system_bus) +{ + if (!dbus_bus_name_has_owner(system_bus->bus, XDG_PORTAL_SERVICE_NAME, NULL)) { + pw_log_warn("Can't find %s. Is xdg-desktop-portal running?", XDG_PORTAL_SERVICE_NAME); + return false; + } + + return true; +} + +void pw_rtkit_bus_free(struct pw_rtkit_bus *system_bus) +{ + dbus_connection_close(system_bus->bus); + dbus_connection_unref(system_bus->bus); + free(system_bus); +} + +static int translate_error(const char *name) +{ + pw_log_warn("RTKit error: %s", name); + + if (spa_streq(name, DBUS_ERROR_NO_MEMORY)) + return -ENOMEM; + if (spa_streq(name, DBUS_ERROR_SERVICE_UNKNOWN) || + spa_streq(name, DBUS_ERROR_NAME_HAS_NO_OWNER)) + return -ENOENT; + if (spa_streq(name, DBUS_ERROR_ACCESS_DENIED) || + spa_streq(name, DBUS_ERROR_AUTH_FAILED)) + return -EACCES; + + return -EIO; +} + +static long long rtkit_get_int_property(struct impl *impl, const char *propname, + long long *propval) +{ + DBusMessage *m = NULL, *r = NULL; + DBusMessageIter iter, subiter; + dbus_int64_t i64; + dbus_int32_t i32; + DBusError error; + int current_type; + long long ret; + struct pw_rtkit_bus *connection = impl->rtkit_bus; + + dbus_error_init(&error); + + if (!(m = dbus_message_new_method_call(impl->service_name, + impl->object_path, + "org.freedesktop.DBus.Properties", "Get"))) { + ret = -ENOMEM; + goto finish; + } + + if (!dbus_message_append_args(m, + DBUS_TYPE_STRING, &impl->interface, + DBUS_TYPE_STRING, &propname, DBUS_TYPE_INVALID)) { + ret = -ENOMEM; + goto finish; + } + + if (!(r = dbus_connection_send_with_reply_and_block(connection->bus, m, -1, &error))) { + ret = translate_error(error.name); + goto finish; + } + + if (dbus_set_error_from_message(&error, r)) { + ret = translate_error(error.name); + goto finish; + } + + ret = -EBADMSG; + dbus_message_iter_init(r, &iter); + while ((current_type = dbus_message_iter_get_arg_type(&iter)) != DBUS_TYPE_INVALID) { + + if (current_type == DBUS_TYPE_VARIANT) { + dbus_message_iter_recurse(&iter, &subiter); + + while ((current_type = + dbus_message_iter_get_arg_type(&subiter)) != DBUS_TYPE_INVALID) { + + if (current_type == DBUS_TYPE_INT32) { + dbus_message_iter_get_basic(&subiter, &i32); + *propval = i32; + ret = 0; + } + + if (current_type == DBUS_TYPE_INT64) { + dbus_message_iter_get_basic(&subiter, &i64); + *propval = i64; + ret = 0; + } + + dbus_message_iter_next(&subiter); + } + } + dbus_message_iter_next(&iter); + } + +finish: + + if (m) + dbus_message_unref(m); + + if (r) + dbus_message_unref(r); + + dbus_error_free(&error); + + return ret; +} + +int pw_rtkit_get_max_realtime_priority(struct impl *impl) +{ + long long retval; + int err; + + err = rtkit_get_int_property(impl, "MaxRealtimePriority", &retval); + return err < 0 ? err : retval; +} + +int pw_rtkit_get_min_nice_level(struct impl *impl, int *min_nice_level) +{ + long long retval; + int err; + + err = rtkit_get_int_property(impl, "MinNiceLevel", &retval); + if (err >= 0) + *min_nice_level = retval; + return err; +} + +long long pw_rtkit_get_rttime_usec_max(struct impl *impl) +{ + long long retval; + int err; + + err = rtkit_get_int_property(impl, "RTTimeUSecMax", &retval); + return err < 0 ? err : retval; +} + +int pw_rtkit_make_realtime(struct impl *impl, pid_t thread, int priority) +{ + DBusMessage *m = NULL, *r = NULL; + dbus_uint64_t pid; + dbus_uint64_t u64; + dbus_uint32_t u32; + DBusError error; + int ret; + struct pw_rtkit_bus *connection = impl->rtkit_bus; + + dbus_error_init(&error); + + if (thread == 0) + thread = _gettid(); + + if (!(m = dbus_message_new_method_call(impl->service_name, + impl->object_path, impl->interface, + "MakeThreadRealtimeWithPID"))) { + ret = -ENOMEM; + goto finish; + } + + pid = (dbus_uint64_t) getpid(); + u64 = (dbus_uint64_t) thread; + u32 = (dbus_uint32_t) priority; + + if (!dbus_message_append_args(m, + DBUS_TYPE_UINT64, &pid, + DBUS_TYPE_UINT64, &u64, + DBUS_TYPE_UINT32, &u32, DBUS_TYPE_INVALID)) { + ret = -ENOMEM; + goto finish; + } + + if (!(r = dbus_connection_send_with_reply_and_block(connection->bus, m, -1, &error))) { + ret = translate_error(error.name); + goto finish; + } + + + if (dbus_set_error_from_message(&error, r)) { + ret = translate_error(error.name); + goto finish; + } + + ret = 0; + +finish: + + if (m) + dbus_message_unref(m); + + if (r) + dbus_message_unref(r); + + dbus_error_free(&error); + + return ret; +} + +int pw_rtkit_make_high_priority(struct impl *impl, pid_t thread, int nice_level) +{ + DBusMessage *m = NULL, *r = NULL; + dbus_uint64_t pid; + dbus_uint64_t u64; + dbus_int32_t s32; + DBusError error; + int ret; + struct pw_rtkit_bus *connection = impl->rtkit_bus; + + dbus_error_init(&error); + + if (thread == 0) + thread = _gettid(); + + if (!(m = dbus_message_new_method_call(impl->service_name, + impl->object_path, impl->interface, + "MakeThreadHighPriorityWithPID"))) { + ret = -ENOMEM; + goto finish; + } + + pid = (dbus_uint64_t) getpid(); + u64 = (dbus_uint64_t) thread; + s32 = (dbus_int32_t) nice_level; + + if (!dbus_message_append_args(m, + DBUS_TYPE_UINT64, &pid, + DBUS_TYPE_UINT64, &u64, + DBUS_TYPE_INT32, &s32, DBUS_TYPE_INVALID)) { + ret = -ENOMEM; + goto finish; + } + + + + if (!(r = dbus_connection_send_with_reply_and_block(connection->bus, m, -1, &error))) { + ret = translate_error(error.name); + goto finish; + } + + + if (dbus_set_error_from_message(&error, r)) { + ret = translate_error(error.name); + goto finish; + } + + ret = 0; + +finish: + + if (m) + dbus_message_unref(m); + + if (r) + dbus_message_unref(r); + + dbus_error_free(&error); + + return ret; +} +#endif /* HAVE_DBUS */ + +static void module_destroy(void *data) +{ + struct impl *impl = data; + pw_context_set_object(impl->context, SPA_TYPE_INTERFACE_ThreadUtils, NULL); + spa_hook_remove(&impl->module_listener); + +#ifdef HAVE_DBUS + if (impl->rtkit_bus) + pw_rtkit_bus_free(impl->rtkit_bus); +#endif + + free(impl); +} + +static const struct pw_impl_module_events module_events = { + PW_VERSION_IMPL_MODULE_EVENTS, + .destroy = module_destroy, +}; + +static int get_rt_priority_range(int *out_min, int *out_max) +{ + int min, max; + + if ((min = sched_get_priority_min(REALTIME_POLICY)) < 0) + return -errno; + if ((max = sched_get_priority_max(REALTIME_POLICY)) < 0) + return -errno; + + if (out_min) + *out_min = min; + if (out_max) + *out_max = max; + + return 0; +} +/** + * Check if the current user has permissions to use realtime scheduling at the + * specified priority. + */ +static bool check_realtime_privileges(struct impl *impl) +{ + rlim_t priority = impl->rt_prio; + int err, old_policy, new_policy, min, max; + struct sched_param old_sched_params; + struct sched_param new_sched_params; + int try = 0; + + while (try++ < 2) { + /* We could check `RLIMIT_RTPRIO`, but the BSDs generally don't have + * that available, and there are also other ways to use realtime + * scheduling without that rlimit being set such as `CAP_SYS_NICE` or + * running as root. Instead of checking a bunch of preconditions, we + * just try if setting realtime scheduling works or not. */ + if ((err = pthread_getschedparam(pthread_self(), &old_policy, &old_sched_params)) != 0) { + pw_log_warn("Failed to check RLIMIT_RTPRIO: %s", strerror(err)); + return false; + } + if ((err = get_rt_priority_range(&min, &max)) < 0) { + pw_log_warn("Failed to get priority range: %s", strerror(err)); + return false; + } + if (try == 2) { + struct rlimit rlim; + /* second try, try to clamp to RLIMIT_RTPRIO */ + if (getrlimit(RLIMIT_RTPRIO, &rlim) == 0 && max > (int)rlim.rlim_max) { + pw_log_info("Clamp rtprio %d to %d", (int)priority, (int)rlim.rlim_max); + max = (int)rlim.rlim_max; + } + else + break; + } + if (max < DEFAULT_RT_PRIO_MIN) { + pw_log_info("Priority max (%d) must be at least %d", max, DEFAULT_RT_PRIO_MIN); + return false; + } + + /* If the current scheduling policy has `SCHED_RESET_ON_FORK` set, then + * this also needs to be set here or `pthread_setschedparam()` will return + * an error code. Similarly, if it is not set, then we don't want to set + * it here as it would irreversible change the current thread's + * scheduling policy. */ + spa_zero(new_sched_params); + new_sched_params.sched_priority = SPA_CLAMP((int)priority, min, max); + new_policy = REALTIME_POLICY; + if ((old_policy & PW_SCHED_RESET_ON_FORK) != 0) + new_policy |= PW_SCHED_RESET_ON_FORK; + + if (pthread_setschedparam(pthread_self(), new_policy, &new_sched_params) == 0) { + impl->rt_prio = new_sched_params.sched_priority; + pthread_setschedparam(pthread_self(), old_policy, &old_sched_params); + return true; + } + } + pw_log_info("Can't set rt prio to %d: %m (try increasing rlimits)", (int)priority); + return false; +} + +static int sched_set_nice(int nice_level) +{ + if (setpriority(PRIO_PROCESS, _gettid(), nice_level) == 0) + return 0; + else + return -errno; +} + +static int set_nice(struct impl *impl, int nice_level, bool warn) +{ + int res = 0; + +#ifdef HAVE_DBUS + if (impl->use_rtkit) + res = pw_rtkit_make_high_priority(impl, 0, nice_level); + else + res = sched_set_nice(nice_level); +#else + res = sched_set_nice(nice_level); +#endif + + if (res < 0) { + if (warn) + pw_log_warn("could not set nice-level to %d: %s", + nice_level, spa_strerror(res)); + } else { + pw_log_info("main thread nice level set to %d", + nice_level); + } + return res; +} + +static int set_rlimit(struct impl *impl) +{ + struct rlimit rl; + int res = 0; + + spa_zero(rl); + rl.rlim_cur = impl->rt_time_soft; + rl.rlim_max = impl->rt_time_hard; + +#ifdef HAVE_DBUS + if (impl->use_rtkit) { + long long rttime; + rttime = pw_rtkit_get_rttime_usec_max(impl); + if (rttime >= 0) { + if ((rlim_t)rttime < rl.rlim_cur) { + pw_log_debug("clamping rt.time.soft from %llu to %lld because of RTKit", + (long long)rl.rlim_cur, rttime); + } + + rl.rlim_cur = SPA_MIN(rl.rlim_cur, (rlim_t)rttime); + rl.rlim_max = SPA_MIN(rl.rlim_max, (rlim_t)rttime); + } + } +#endif + + if (setrlimit(RLIMIT_RTTIME, &rl) < 0) + res = -errno; + + if (res < 0) + pw_log_debug("setrlimit() failed: %s", spa_strerror(res)); + else + pw_log_debug("rt.time.soft:%"PRIi64" rt.time.hard:%"PRIi64, + (int64_t)rl.rlim_cur, (int64_t)rl.rlim_max); + + return res; +} + +static int acquire_rt_sched(struct spa_thread *thread, int priority) +{ + int err, min, max; + struct sched_param sp; + pthread_t pt = (pthread_t)thread; + + if ((err = get_rt_priority_range(&min, &max)) < 0) + return err; + + if (priority < min || priority > max) { + pw_log_info("clamping priority %d to range %d - %d for policy %d", + priority, min, max, REALTIME_POLICY); + priority = SPA_CLAMP(priority, min, max); + } + + spa_zero(sp); + sp.sched_priority = priority; + if ((err = pthread_setschedparam(pt, REALTIME_POLICY | PW_SCHED_RESET_ON_FORK, &sp)) != 0) { + pw_log_warn("could not make thread %p realtime: %s", thread, strerror(err)); + return -err; + } + + pw_log_info("acquired realtime priority %d for thread %p", priority, thread); + return 0; +} + +static int impl_drop_rt_generic(void *object, struct spa_thread *thread) +{ + struct sched_param sp; + pthread_t pt = (pthread_t)thread; + int err; + + spa_zero(sp); + if ((err = pthread_setschedparam(pt, SCHED_OTHER | PW_SCHED_RESET_ON_FORK, &sp)) != 0) { + pw_log_debug("thread %p: SCHED_OTHER|SCHED_RESET_ON_FORK failed: %s", + thread, strerror(err)); + return -err; + } + pw_log_info("thread %p dropped realtime priority", thread); + return 0; +} + +#ifdef HAVE_DBUS +static struct thread *find_thread_by_pt(struct impl *impl, pthread_t pt) +{ + struct thread *t; + + spa_list_for_each(t, &impl->threads_list, link) { + if (pthread_equal(t->thread, pt)) + return t; + } + return NULL; +} + +static void *custom_start(void *data) +{ + struct thread *this = data; + struct impl *impl = this->impl; + + pthread_mutex_lock(&impl->lock); + this->pid = _gettid(); + pthread_cond_broadcast(&impl->cond); + pthread_mutex_unlock(&impl->lock); + + return this->start(this->arg); +} + +static struct spa_thread *impl_create(void *object, const struct spa_dict *props, + void *(*start_routine)(void*), void *arg) +{ + struct impl *impl = object; + struct thread *this; + struct spa_thread *thread; + + this = calloc(1, sizeof(*this)); + this->impl = impl; + this->start = start_routine; + this->arg = arg; + + /* This thread list is only used for the RTKit implementation */ + pthread_mutex_lock(&impl->lock); + thread = pw_thread_utils_create(props, custom_start, this); + if (thread == NULL) + goto exit; + + this->thread = (pthread_t)thread; + pthread_cond_wait(&impl->cond, &impl->lock); + + spa_list_append(&impl->threads_list, &this->link); +exit: + pthread_mutex_unlock(&impl->lock); + + if (thread == NULL) { + free(this); + return NULL; + } + return thread; +} + +static int impl_join(void *object, struct spa_thread *thread, void **retval) +{ + struct impl *impl = object; + pthread_t pt = (pthread_t)thread; + struct thread *thr; + + pthread_mutex_lock(&impl->lock); + if ((thr = find_thread_by_pt(impl, pt)) != NULL) { + spa_list_remove(&thr->link); + free(thr); + } + pthread_mutex_unlock(&impl->lock); + + return pthread_join(pt, retval); +} + + +static int get_rtkit_priority_range(struct impl *impl, int *min, int *max) +{ + if (min) + *min = 1; + if (max) { + if ((*max = pw_rtkit_get_max_realtime_priority(impl)) < 0) + return *max; + if (*max < 1) + *max = 1; + } + return 0; +} + +static int impl_get_rt_range(void *object, const struct spa_dict *props, + int *min, int *max) +{ + struct impl *impl = object; + int res; + if (impl->use_rtkit) + res = get_rtkit_priority_range(impl, min, max); + else + res = get_rt_priority_range(min, max); + return res; +} + +static pid_t impl_gettid(struct impl *impl, pthread_t pt) +{ + struct thread *thr; + pid_t pid; + + pthread_mutex_lock(&impl->lock); + if ((thr = find_thread_by_pt(impl, pt)) != NULL) + pid = thr->pid; + else + pid = _gettid(); + pthread_mutex_unlock(&impl->lock); + + return pid; +} + +static int impl_acquire_rt(void *object, struct spa_thread *thread, int priority) +{ + struct impl *impl = object; + struct sched_param sp; + int err; + pthread_t pt = (pthread_t)thread; + pid_t pid; + + /* See the docstring on `spa_thread_utils_methods::acquire_rt` */ + if (priority == -1) { + priority = impl->rt_prio; + } + + if (impl->use_rtkit) { + int min, max; + + if ((err = get_rtkit_priority_range(impl, &min, &max)) < 0) + return err; + + pid = impl_gettid(impl, pt); + + if (priority < min || priority > max) { + pw_log_info("clamping requested priority %d for thread %d " + "between %d and %d", priority, pid, min, max); + priority = SPA_CLAMP(priority, min, max); + } + + spa_zero(sp); + sp.sched_priority = priority; + + if (pthread_setschedparam(pt, SCHED_OTHER | PW_SCHED_RESET_ON_FORK, &sp) == 0) { + pw_log_debug("SCHED_OTHER|SCHED_RESET_ON_FORK worked."); + } + + if ((err = pw_rtkit_make_realtime(impl, pid, priority)) < 0) { + pw_log_warn("could not make thread %d realtime using RTKit: %s", pid, spa_strerror(err)); + return err; + } + + pw_log_info("acquired realtime priority %d for thread %d using RTKit", priority, pid); + return 0; + } else { + return acquire_rt_sched(thread, priority); + } +} + +static const struct spa_thread_utils_methods impl_thread_utils = { + SPA_VERSION_THREAD_UTILS_METHODS, + .create = impl_create, + .join = impl_join, + .get_rt_range = impl_get_rt_range, + .acquire_rt = impl_acquire_rt, + .drop_rt = impl_drop_rt_generic, +}; + +#else /* HAVE_DBUS */ + +static struct spa_thread *impl_create(void *object, const struct spa_dict *props, + void *(*start_routine)(void*), void *arg) +{ + return pw_thread_utils_create(props, start_routine, arg); +} + +static int impl_join(void *object, struct spa_thread *thread, void **retval) +{ + return pw_thread_utils_join(thread, retval); +} + +static int impl_get_rt_range(void *object, const struct spa_dict *props, + int *min, int *max) +{ + return get_rt_priority_range(min, max); +} + +static int impl_acquire_rt(void *object, struct spa_thread *thread, int priority) +{ + struct impl *impl = object; + + /* See the docstring on `spa_thread_utils_methods::acquire_rt` */ + if (priority == -1) + priority = impl->rt_prio; + + return acquire_rt_sched(thread, priority); +} + +static const struct spa_thread_utils_methods impl_thread_utils = { + SPA_VERSION_THREAD_UTILS_METHODS, + .create = impl_create, + .join = impl_join, + .get_rt_range = impl_get_rt_range, + .acquire_rt = impl_acquire_rt, + .drop_rt = impl_drop_rt_generic, +}; +#endif /* HAVE_DBUS */ + + +#ifdef HAVE_DBUS +static int check_rtkit(struct impl *impl, struct pw_context *context, bool *can_use_rtkit) +{ + const struct pw_properties *context_props; + const char *str; + + *can_use_rtkit = true; + + if ((context_props = pw_context_get_properties(context)) != NULL && + (str = pw_properties_get(context_props, "support.dbus")) != NULL && + !pw_properties_parse_bool(str)) + *can_use_rtkit = false; + + return 0; +} +#endif /* HAVE_DBUS */ + +SPA_EXPORT +int pipewire__module_init(struct pw_impl_module *module, const char *args) +{ + struct pw_context *context = pw_impl_module_get_context(module); + struct impl *impl; + struct pw_properties *props; + int res = 0; + + PW_LOG_TOPIC_INIT(mod_topic); + + impl = calloc(1, sizeof(struct impl)); + if (impl == NULL) + return -ENOMEM; + + pw_log_debug("module %p: new", impl); + + props = args ? pw_properties_new_string(args) : pw_properties_new(NULL, NULL); + if (!props) { + res = -errno; + goto error; + } + + impl->context = context; + impl->nice_level = pw_properties_get_int32(props, "nice.level", DEFAULT_NICE_LEVEL); + impl->rt_prio = pw_properties_get_int32(props, "rt.prio", DEFAULT_RT_PRIO); + impl->rt_time_soft = pw_properties_get_int32(props, "rt.time.soft", DEFAULT_RT_TIME_SOFT); + impl->rt_time_hard = pw_properties_get_int32(props, "rt.time.hard", DEFAULT_RT_TIME_HARD); + + bool can_use_rtkit = false, use_rtkit = false; + +#ifdef HAVE_DBUS + spa_list_init(&impl->threads_list); + pthread_mutex_init(&impl->lock, NULL); + pthread_cond_init(&impl->cond, NULL); + + if ((res = check_rtkit(impl, context, &can_use_rtkit)) < 0) + goto error; +#endif + /* If the user has permissions to use regular realtime scheduling, as well as + * the nice level we want, then we'll use that instead of RTKit */ + if (!check_realtime_privileges(impl)) { + if (!can_use_rtkit) { + res = -ENOTSUP; + pw_log_warn("regular realtime scheduling not available (RTKit fallback disabled)"); + goto error; + } + use_rtkit = true; + } + + if (IS_VALID_NICE_LEVEL(impl->nice_level)) { + if (set_nice(impl, impl->nice_level, !can_use_rtkit) < 0) + use_rtkit = can_use_rtkit; + } + +#ifdef HAVE_DBUS + impl->use_rtkit = use_rtkit; + if (impl->use_rtkit) { + /* Checking xdg-desktop-portal. It works fine in all situations. */ + impl->rtkit_bus = pw_rtkit_bus_get_session(); + if (impl->rtkit_bus != NULL) { + if (pw_rtkit_check_xdg_portal(impl->rtkit_bus)) { + impl->service_name = XDG_PORTAL_SERVICE_NAME; + impl->object_path = XDG_PORTAL_OBJECT_PATH; + impl->interface = XDG_PORTAL_INTERFACE; + } else { + pw_log_warn("found session bus but no portal"); + pw_rtkit_bus_free(impl->rtkit_bus); + impl->rtkit_bus = NULL; + } + } + /* Failed to get xdg-desktop-portal, try to use rtkit. */ + if (impl->rtkit_bus == NULL) { + impl->rtkit_bus = pw_rtkit_bus_get_system(); + if (impl->rtkit_bus != NULL) { + impl->service_name = RTKIT_SERVICE_NAME; + impl->object_path = RTKIT_OBJECT_PATH; + impl->interface = RTKIT_INTERFACE; + } else { + res = -errno; + pw_log_warn("could not get system bus: %m"); + goto error; + } + } + /* Retry set_nice with rtkit */ + if (IS_VALID_NICE_LEVEL(impl->nice_level)) + set_nice(impl, impl->nice_level, true); + } +#endif + set_rlimit(impl); + + impl->thread_utils.iface = SPA_INTERFACE_INIT( + SPA_TYPE_INTERFACE_ThreadUtils, + SPA_VERSION_THREAD_UTILS, + &impl_thread_utils, impl); + + pw_context_set_object(context, SPA_TYPE_INTERFACE_ThreadUtils, + &impl->thread_utils); + + pw_impl_module_add_listener(module, &impl->module_listener, &module_events, impl); + + pw_impl_module_update_properties(module, &SPA_DICT_INIT_ARRAY(module_props)); + pw_impl_module_update_properties(module, &props->dict); + +#ifdef HAVE_DBUS + if (impl->use_rtkit) { + pw_log_debug("initialized using RTKit"); + } else { + pw_log_debug("initialized using regular realtime scheduling"); + } +#else + pw_log_debug("initialized using regular realtime scheduling"); +#endif + + goto done; + +error: +#ifdef HAVE_DBUS + if (impl->rtkit_bus) + pw_rtkit_bus_free(impl->rtkit_bus); +#endif + free(impl); +done: + pw_properties_free(props); + + return res; +} |