X-Git-Url: https://git.sesse.net/?a=blobdiff_plain;f=alsa_pool.cpp;h=bcda16315329e87b039a5240a015e7b050c4d5d3;hb=refs%2Fheads%2Fmultichannel_audio;hp=22a61af88d27e982a229bf8f8eccbe593c8c9612;hpb=12ef90072622a8001f2c3cc853e5b89ba7d4e94e;p=nageru

diff --git a/alsa_pool.cpp b/alsa_pool.cpp
index 22a61af..bcda163 100644
--- a/alsa_pool.cpp
+++ b/alsa_pool.cpp
@@ -1,15 +1,21 @@
 #include "alsa_pool.h"
 
-#include <alsa/control.h>
-#include <alsa/error.h>
-#include <alsa/pcm.h>
+#include <alsa/asoundlib.h>
 #include <assert.h>
+#include <errno.h>
 #include <limits.h>
+#include <poll.h>
+#include <stdint.h>
 #include <stdio.h>
+#include <sys/eventfd.h>
 #include <sys/inotify.h>
 #include <unistd.h>
 #include <algorithm>
+#include <chrono>
+#include <functional>
+#include <iterator>
 #include <memory>
+#include <ratio>
 
 #include "alsa_input.h"
 #include "audio_mixer.h"
@@ -20,6 +26,12 @@
 using namespace std;
 using namespace std::placeholders;
 
+ALSAPool::ALSAPool()
+{
+	should_quit_fd = eventfd(/*initval=*/0, /*flags=*/0);
+	assert(should_quit_fd != -1);
+}
+
 ALSAPool::~ALSAPool()
 {
 	for (Device &device : devices) {
@@ -28,7 +40,16 @@ ALSAPool::~ALSAPool()
 		}
 	}
 	should_quit = true;
+	const uint64_t one = 1;
+	if (write(should_quit_fd, &one, sizeof(one)) != sizeof(one)) {
+		perror("write(should_quit_fd)");
+		exit(1);
+	}
 	inotify_thread.join();
+
+	while (retry_threads_running > 0) {
+		this_thread::sleep_for(std::chrono::milliseconds(100));
+	}
 }
 
 std::vector<ALSAPool::Device> ALSAPool::get_devices()
@@ -104,6 +125,7 @@ void ALSAPool::probe_device_with_retry(unsigned card_index, unsigned dev_index)
 	// then start it ourselves.
 	fprintf(stderr, "Trying %s again in one second...\n", address);
 	add_device_tries_left[address] = num_retries;
+	++retry_threads_running;
 	thread(&ALSAPool::probe_device_retry_thread_func, this, card_index, dev_index).detach();
 }
 
@@ -117,11 +139,12 @@ void ALSAPool::probe_device_retry_thread_func(unsigned card_index, unsigned dev_
 
 		// See if there are any retries left.
 		lock_guard<mutex> lock(add_device_mutex);
-		if (!add_device_tries_left.count(address) ||
+		if (should_quit ||
+		    !add_device_tries_left.count(address) ||
 		    add_device_tries_left[address] == 0) {
 			add_device_tries_left.erase(address);
 			fprintf(stderr, "Giving up probe of %s.\n", address);
-			return;
+			break;
 		}
 
 		// Seemingly there were. Give it a try (we still hold the mutex).
@@ -129,11 +152,11 @@ void ALSAPool::probe_device_retry_thread_func(unsigned card_index, unsigned dev_
 		if (result == ProbeResult::SUCCESS) {
 			add_device_tries_left.erase(address);
 			fprintf(stderr, "Probe of %s succeeded.\n", address);
-			return;
+			break;
 		} else if (result == ProbeResult::FAILURE || --add_device_tries_left[address] == 0) {
 			add_device_tries_left.erase(address);
 			fprintf(stderr, "Giving up probe of %s.\n", address);
-			return;
+			break;
 		}
 
 		// Failed again.
@@ -141,6 +164,8 @@ void ALSAPool::probe_device_retry_thread_func(unsigned card_index, unsigned dev_
 		fprintf(stderr, "Trying %s again in one second (%d tries left)...\n",
 			address, add_device_tries_left[address]);
 	}
+
+	--retry_threads_running;
 }
 
 ALSAPool::ProbeResult ALSAPool::probe_device_once(unsigned card_index, unsigned dev_index)
@@ -281,12 +306,15 @@ void ALSAPool::inotify_thread_func()
 	int size = sizeof(inotify_event) + NAME_MAX + 1;
 	unique_ptr<char[]> buf(new char[size]);
 	while (!should_quit) {
-		pollfd fds;
-		fds.fd = inotify_fd;
-		fds.events = POLLIN;
-		fds.revents = 0;
-
-		int ret = poll(&fds, 1, 100);
+		pollfd fds[2];
+		fds[0].fd = inotify_fd;
+		fds[0].events = POLLIN;
+		fds[0].revents = 0;
+		fds[1].fd = should_quit_fd;
+		fds[1].events = POLLIN;
+		fds[1].revents = 0;
+
+		int ret = poll(fds, 2, -1);
 		if (ret == -1) {
 			if (errno == EINTR) {
 				continue;
@@ -299,6 +327,8 @@ void ALSAPool::inotify_thread_func()
 			continue;
 		}
 
+		if (fds[1].revents) break;  // should_quit_fd asserted.
+
 		ret = read(inotify_fd, buf.get(), size);
 		if (ret == -1) {
 			if (errno == EINTR) {
@@ -342,6 +372,7 @@ void ALSAPool::inotify_thread_func()
 	}
 	close(watch_fd);
 	close(inotify_fd);
+	close(should_quit_fd);
 }
 
 void ALSAPool::reset_device(unsigned index)