4 files changed, 140 insertions, 6 deletions

diff --git a/src/build.c b/src/build.c
new file mode 100644
index 0000000..d846217
--- /dev/null
+++ b/src/build.c
@@ -0,0 +1,69 @@
+#include <errno.h>
+#include <stdbool.h>
+#include <pthread.h>
+#include <stdlib.h>
+#include <string.h>
+
+#include "build.h"
+#include "queue.h"
+#include "jobs.h"
+#include "util.h"
+
+static int build(struct queue *queue);
+
+void *build_thread_entry(void *build_thread)
+{
+	struct build_thread *bt = build_thread;
+	int ret = 0;
+
+	while (true) {
+		ret = sem_wait(&bt->queue->sem);
+		if (ret < 0) {
+			print_err("%s", strerror(errno));
+			goto out;
+		}
+
+		if (CIRCLEQ_EMPTY(&bt->queue->jobs)) {
+			if (bt->queue->state == Q_ITS_OVER)
+				goto out;
+			else if (bt->queue->state == Q_SEM_WAIT)
+				continue;
+		}
+
+		ret = build(bt->queue);
+		if (ret < 0)
+			goto out;
+	}
+
+out:
+	pthread_exit(NULL);
+}
+
+static int build(struct queue *queue) {
+	struct job *job;
+	int ret = 0;
+
+	ret = queue_pop(queue, &job);
+	if (ret < 0)
+		return ret;
+
+	printf("nix build %s^*\n", job->drv_path);
+	job_free(job);
+
+	return 0;
+}
+
+int build_thread_new(struct build_thread **build_thread, struct queue *q)
+{
+	struct build_thread *bt = NULL;
+
+	bt = malloc(sizeof(*bt));
+	if (bt == NULL) {
+		print_err("%s", strerror(errno));
+		return -errno;
+	}
+	bt->queue = q;
+
+	*build_thread = bt;
+	return 0;
+}
diff --git a/src/evanix.c b/src/evanix.c
index dcac070..e83d0ea 100644
--- a/src/evanix.c
+++ b/src/evanix.c
@@ -1,12 +1,14 @@
 #include <stdlib.h>
 #include <string.h>
 
+#include "build.h"
 #include "queue.h"
 #include "util.h"
 
 int main(void)
 {
 	struct queue_thread *queue_thread = NULL;
+	struct build_thread *build_thread = NULL;
 	FILE *stream = NULL;
 	int ret = 0;
 
@@ -20,22 +22,40 @@ int main(void)
 		goto out_free;
 	}
 
+	ret = build_thread_new(&build_thread, queue_thread->queue);
+	if (ret < 0) {
+		free(stream);
+		goto out_free;
+	}
+
 	ret = pthread_create(&queue_thread->tid, NULL, queue_thread_entry,
 			     queue_thread);
 	if (ret < 0) {
 		print_err("%s", strerror(ret));
-		ret = -ret;
+		goto out_free;
+	}
+
+	ret = pthread_create(&build_thread->tid, NULL, build_thread_entry,
+			     build_thread);
+	if (ret < 0) {
+		print_err("%s", strerror(ret));
 		goto out_free;
 	}
 
 	ret = pthread_join(queue_thread->tid, NULL);
 	if (ret < 0) {
 		print_err("%s", strerror(ret));
-		ret = -ret;
+		goto out_free;
+	}
+
+	ret = pthread_join(build_thread->tid, NULL);
+	if (ret < 0) {
+		print_err("%s", strerror(ret));
 		goto out_free;
 	}
 
 out_free:
 	queue_thread_free(queue_thread);
+	free(build_thread);
 	exit(ret < 0 ? EXIT_FAILURE : EXIT_SUCCESS);
 }
diff --git a/src/meson.build b/src/meson.build
index bb68e18..41b31da 100644
--- a/src/meson.build
+++ b/src/meson.build
@@ -5,6 +5,7 @@ e = executable(
 		'jobs.c',
 		'util.c',
 		'queue.c',
+		'build.c',
 	],
 
 	include_directories: evanix_inc,
diff --git a/src/queue.c b/src/queue.c
index 6bf9092..746750e 100644
--- a/src/queue.c
+++ b/src/queue.c
@@ -8,6 +8,8 @@
 #include "queue.h"
 #include "util.h"
 
+static void queue_push(struct queue *queue, struct job *job);
+
 void *queue_thread_entry(void *queue_thread)
 {
 	struct queue_thread *qt = queue_thread;
@@ -17,23 +19,51 @@ void *queue_thread_entry(void *queue_thread)
 	while (true) {
 		ret = job_read(qt->stream, &job);
 		if (ret == -EOF) {
+			qt->queue->state = Q_ITS_OVER;
+			sem_post(&qt->queue->sem);
+
 			ret = 0;
 			break;
 		} else if (ret < 0) {
 			break;
 		}
 
-		pthread_mutex_lock(&qt->queue->mutex);
-		CIRCLEQ_INSERT_TAIL(&qt->queue->jobs, job, clist);
-		pthread_mutex_unlock(&qt->queue->mutex);
+		queue_push(qt->queue, job);
 	}
 
 	pthread_exit(NULL);
 }
 
+int queue_pop(struct queue *queue, struct job **job)
+{
+	struct job *j = CIRCLEQ_FIRST(&queue->jobs);
+
+	if (CIRCLEQ_EMPTY(&queue->jobs)) {
+		print_err("%s", "Empty queue");
+		return -EPERM;
+	}
+
+	pthread_mutex_lock(&queue->mutex);
+	CIRCLEQ_REMOVE(&queue->jobs, j, clist);
+	pthread_mutex_unlock(&queue->mutex);
+
+	*job = j;
+	return 0;
+}
+
+static void queue_push(struct queue *queue, struct job *job)
+{
+	pthread_mutex_lock(&queue->mutex);
+	CIRCLEQ_INSERT_TAIL(&queue->jobs, job, clist);
+	pthread_mutex_unlock(&queue->mutex);
+
+	sem_post(&queue->sem);
+}
+
 void queue_thread_free(struct queue_thread *queue_thread)
 {
 	struct job *job;
+	int ret;
 
 	if (queue_thread == NULL)
 		return;
@@ -43,6 +73,13 @@ void queue_thread_free(struct queue_thread *queue_thread)
 		free(job);
 	}
 
+	ret = sem_destroy(&queue_thread->queue->sem);
+	if (ret < 0)
+		print_err("%s", strerror(errno));
+	ret = pthread_mutex_destroy(&queue_thread->queue->mutex);
+	if (ret < 0)
+		print_err("%s", strerror(errno));
+
 	free(queue_thread->queue);
 	fclose(queue_thread->stream);
 }
@@ -57,7 +94,6 @@ int queue_thread_new(struct queue_thread **queue_thread, FILE *stream)
 		print_err("%s", strerror(errno));
 		return -errno;
 	}
-
 	qt->stream = stream;
 
 	qt->queue = malloc(sizeof(*qt->queue));
@@ -66,6 +102,14 @@ int queue_thread_new(struct queue_thread **queue_thread, FILE *stream)
 		ret = -errno;
 		goto out_free;
 	}
+	qt->queue->state = Q_SEM_WAIT;
+	ret = sem_init(&qt->queue->sem, 0, 0);
+	if (ret < 0) {
+		print_err("%s", strerror(errno));
+		ret = -errno;
+		goto out_free;
+	}
+
 	CIRCLEQ_INIT(&qt->queue->jobs);
 	pthread_mutex_init(&qt->queue->mutex, NULL);