Start reading files in a separate thread

Makefile

@@ -27,7 +27,7 @@ CFLAGS   += -Wall -I$(ELPHEL_KERNEL_DIR)/include/elphel
 all: $(PROGS)
 
 $(PROGS): $(OBJS)
-	$(CC) $(LDFLAGS) $^ $(LDLIBS) -logg  -o $@
+	$(CC) $(LDFLAGS) $^ $(LDLIBS) -logg -pthread -o $@
 install: $(PROGS)
 	$(INSTALL) -d $(INSTDIR)
 	$(INSTALL) -m $(INSTMODE) -o $(INSTOWNER) -g $(INSTGROUP) $(PROGS) $(INSTDIR)

camogm.c

@@ -87,6 +87,8 @@ camogm_state sstate;
 /** @brief Memory mapped circular buffer arrays */
 unsigned long * ccam_dma_buf[SENSOR_PORTS];
 
+pthread_mutex_t print_mutex = PTHREAD_MUTEX_INITIALIZER;
+
 /**
  * @enum path_type
  * @brief Define the path type passed to a function
@@ -226,7 +228,8 @@ void camogm_init(camogm_state *state, char *pipe_name)
 	state->pipe_name = pipe_name;
 	state->rawdev.start_pos = RAWDEV_START_OFFSET;
 	state->rawdev.end_pos = state->rawdev.start_pos;
-	state->rawdev.curr_pos = state->rawdev.start_pos;
+	state->rawdev.curr_pos_w = state->rawdev.start_pos;
+	state->rawdev.curr_pos_r = state->rawdev.start_pos;
 	state->active_chn = ALL_CHN_ACTIVE;
 }
 
@@ -799,7 +802,7 @@ void  camogm_set_prefix(camogm_state *state, const char * p, path_type type)
 			D0(fprintf(debug_file, "WARNING: raw device write initiated\n"));
 			state->rawdev_op = 1;
 			/* debug code follows */
-			state->rawdev.end_pos = 10485760; // 10 Mib
+//			state->rawdev.end_pos = 10485760; // 10 Mib
 			/* end of debug code */
 		}
 	}
@@ -874,6 +877,7 @@ void  camogm_set_start_after_timestamp(camogm_state *state, double d)
  * @param[in]   fn      a pointer to a file name which will be used for output. Can be NULL or 'stdout' for
  * output to stdout, 'stderr' for output to stderr and a file name for output to a file
  * @param[in]   xml     flag indicating that the output should be in xml format
+ * @note access to state->rawdev.curr_pos_r is not locked in reading thread
  * @return      None
  */
 void  camogm_status(camogm_state *state, char * fn, int xml)
@@ -888,6 +892,7 @@ void  camogm_status(camogm_state *state, char * fn, int xml)
 	int _frames_skip = 0;
 	int _sec_skip = 0;
 	char *_kml_enable, *_kml_used, *_kml_height_mode;
+	unsigned int _percent_done;
 
 	_kml_enable =      state->kml_enable ? "yes" : "no";
 	_kml_used =        state->kml_used ? "yes" : "no";
@@ -956,6 +961,10 @@ void  camogm_status(camogm_state *state, char * fn, int xml)
 					       "other"))) : "none";
 	_using_exif =    state->exif ? "yes" : "no";
 	_using_global_pointer = state->save_gp ? "yes" : "no";
+	if (state->rawdev.curr_pos_r != 0 && state->rawdev.curr_pos_r > state->rawdev.start_pos)
+		_percent_done = 100 * state->rawdev.curr_pos_r / (state->rawdev.end_pos - state->rawdev.start_pos);
+	else
+		_percent_done = 0;
 
 	if (xml) {
 		fprintf(f, "<?xml version=\"1.0\"?>\n" \
@@ -995,7 +1004,9 @@ void  camogm_status(camogm_state *state, char * fn, int xml)
 			"  <greedy>\"%s\"</greedy>\n" \
 			"  <ignore_fps>\"%s\"</ignore_fps>\n" \
 			"  <raw_device_path>\"%s\"</raw_device_path>\n" \
-			"  <raw_device_overruns>%d</raw_device_overruns>\n",
+			"  <raw_device_overruns>%d</raw_device_overruns>\n" \
+			"  <raw_device_pos_write>0x%llx</raw_dev_pos_write>\n" \
+			"  <raw_device_pos_read>0x%llx (%d\% done)</raw_device_pos_read>\n",
 			_state,  state->path, state->frameno, state->start_after_timestamp, _dur, _udur, _len, \
 			_frames_skip, _sec_skip, \
 			state->width, state->height, _output_format, _using_exif, \
@@ -1005,7 +1016,7 @@ void  camogm_status(camogm_state *state, char * fn, int xml)
 			_kml_enable, _kml_used, state->kml_path, state->kml_horHalfFov, state->kml_vertHalfFov, state->kml_near, \
 			_kml_height_mode, state->kml_height, state->kml_period, state->kml_last_ts, state->kml_last_uts, \
 			state->greedy ? "yes" : "no", state->ignore_fps ? "yes" : "no", state->rawdev.rawdev_path,
-			state->rawdev.overrun);
+			state->rawdev.overrun, state->rawdev.curr_pos_w, state->rawdev.curr_pos_r, _percent_done);
 
 		FOR_EACH_PORT(int, chn) {
 			char *_active = is_chn_active(state, chn) ? "yes" : "no";
@@ -1054,6 +1065,9 @@ void  camogm_status(camogm_state *state, char * fn, int xml)
 		fprintf(f, "path prefix        \t%s\n",        state->path_prefix);
 		fprintf(f, "raw device path    \t%s\n",        state->rawdev.rawdev_path);
 		fprintf(f, "raw device overruns\t%d\n",        state->rawdev.overrun);
+		fprintf(f, "raw write position \t0x%llx\n",    state->rawdev.curr_pos_w);
+		fprintf(f, "raw read position  \t0x%llx\n",    state->rawdev.curr_pos_r);
+		fprintf(f, "   percent done    \t%d\%\n",      _percent_done);
 		fprintf(f, "max file duration  \t%d sec\n",    state->segment_duration);
 		fprintf(f, "max file length    \t%d B\n",      state->segment_length);
 		fprintf(f, "max frames         \t%d\n",        state->max_frames);
@@ -1321,6 +1335,13 @@ int parse_cmd(camogm_state *state, FILE* npipe)
 			D0(fprintf(debug_file, "Unable to switch state to 'reading' from current state. Check settings.\n"));
 		}
 		return 29;
+	} else if (strcmp(cmd, "rawdev_stop") == 0) {
+		if (state->prog_state == STATE_READING) {
+			state->rawdev.thread_state = STATE_CANCEL;
+		} else {
+			D0(fprintf(debug_file, "Reading thread is not running, nothing to stop\n"));
+		}
+		return 30;
 	}
 
 	return -1;
@@ -1356,6 +1377,7 @@ void clean_up(camogm_state *state)
  */
 int listener_loop(camogm_state *state)
 {
+	void *tret;
 	FILE *cmd_file;
 	int rslt, ret, cmd, f_ok;
 	int fp0, fp1;
@@ -1469,10 +1491,34 @@ int listener_loop(camogm_state *state)
 				exit(-1);
 			} // switch camogm_start()
 			if ((rslt != 0) && (rslt != CAMOGM_TOO_EARLY) && (rslt != CAMOGM_FRAME_NOT_READY) && (rslt != CAMOGM_FRAME_CHANGED) ) state->last_error_code = rslt;
-
 		} else if (state->prog_state == STATE_READING) {
-			build_index(state);
-			state->prog_state = STATE_STOPPED;
+			if (state->rawdev.thread_state == STATE_RUNNING) {
+				if (state->rawdev.thread_finished == true) {
+					state->rawdev.thread_state = STATE_STOPPED;
+					state->rawdev.thread_finished = false;
+					state->prog_state = STATE_STOPPED;
+					pthread_join(state->rawdev.tid, &tret);
+					if ((int)tret != 0 && (int)tret != PTHREAD_CANCELED) {
+						D0(fprintf(debug_file, "Reading thread returned error %d\n", (int)tret));
+					} else {
+						D3(fprintf(debug_file, "Reading thread stopped\n"));
+					}
+				} else {
+					usleep(COMMAND_LOOP_DELAY);
+				}
+			} else if (state->rawdev.thread_state == STATE_STOPPED) {
+				state->rawdev.thread_state = STATE_RUNNING;
+				state->rawdev.thread_finished = false;
+				if (pthread_create(&state->rawdev.tid, NULL, build_index, state) != 0) {
+					state->prog_state = STATE_STOPPED;
+					state->rawdev.thread_state = STATE_STOPPED;
+					D0(fprintf(debug_file, "%s:line %d: Can not start new thread, disk index is not built\n", __FILE__, __LINE__));
+				}
+			} else if (state->rawdev.thread_state == STATE_CANCEL) {
+				// cancel reading thread and return to running state waiting for the thread to terminate
+				state->rawdev.thread_state = STATE_RUNNING;
+				pthread_cancel(state->rawdev.tid);
+			}
 		} else {                            // not running, not starting
 			usleep(COMMAND_LOOP_DELAY);     // make it longer but interruptible by signals?
 		}

camogm.h

@@ -19,6 +19,8 @@
 #ifndef _CAMOGM_H
 #define _CAMOGM_H
 
+#include <pthread.h>
+#include <stdbool.h>
 #include <exifa.h>
 #include <c313a.h>
 #include <ogg/ogg.h>
@@ -41,13 +43,13 @@
 #define CAMOGM_FORMAT_MOV         3        ///< output as Apple Quicktime
 
 #define D(x) { if (debug_file && debug_level) { x; fflush(debug_file); } }
-#define D0(x) { if (debug_file) { x; fflush(debug_file); } }
-#define D1(x) { if (debug_file && (debug_level > 0)) { x; fflush(debug_file); } }
-#define D2(x) { if (debug_file && (debug_level > 1)) { x; fflush(debug_file); } }
-#define D3(x) { if (debug_file && (debug_level > 2)) { x; fflush(debug_file); } }
-#define D4(x) { if (debug_file && (debug_level > 3)) { x; fflush(debug_file); } }
-#define D5(x) { if (debug_file && (debug_level > 4)) { x; fflush(debug_file); } }
-#define D6(x) { if (debug_file && (debug_level > 5)) { x; fflush(debug_file); } }
+#define D0(x) { if (debug_file) { pthread_mutex_lock(&print_mutex); x; fflush(debug_file); pthread_mutex_unlock(&print_mutex); } }
+#define D1(x) { if (debug_file && (debug_level > 0)) { pthread_mutex_lock(&print_mutex); x; fflush(debug_file); pthread_mutex_unlock(&print_mutex); } }
+#define D2(x) { if (debug_file && (debug_level > 1)) { pthread_mutex_lock(&print_mutex); x; fflush(debug_file); pthread_mutex_unlock(&print_mutex); } }
+#define D3(x) { if (debug_file && (debug_level > 2)) { pthread_mutex_lock(&print_mutex); x; fflush(debug_file); pthread_mutex_unlock(&print_mutex); } }
+#define D4(x) { if (debug_file && (debug_level > 3)) { pthread_mutex_lock(&print_mutex); x; fflush(debug_file); pthread_mutex_unlock(&print_mutex); } }
+#define D5(x) { if (debug_file && (debug_level > 4)) { pthread_mutex_lock(&print_mutex); x; fflush(debug_file); pthread_mutex_unlock(&print_mutex); } }
+#define D6(x) { if (debug_file && (debug_level > 5)) { pthread_mutex_lock(&print_mutex); x; fflush(debug_file); pthread_mutex_unlock(&print_mutex); } }
 
 //#define DD(x)
 #define DD(x)  { if (debug_file) { fprintf(debug_file, "%s:%d:", __FILE__, __LINE__); x; fflush(debug_file); } }
@@ -67,8 +69,10 @@ enum state_flags {
 	STATE_STOPPED,
 	STATE_STARTING,
 	STATE_RUNNING,
-	STATE_READING
+	STATE_READING,
+	STATE_CANCEL
 };
+
 /**
  * @struct rawdev_buffer
  * @brief Holds pointers related to raw device buffer operation
@@ -94,8 +98,12 @@ typedef struct {
 	uint32_t overrun;
 	uint64_t start_pos;
 	uint64_t end_pos;
-	uint64_t curr_pos;
+	uint64_t curr_pos_w;
+	volatile uint64_t curr_pos_r;
 	uint64_t file_start;
+	pthread_t tid;
+	int thread_state;
+	volatile bool thread_finished;
 } rawdev_buffer;
 
 /**
@@ -190,6 +198,7 @@ typedef struct {
 
 extern int debug_level;
 extern FILE* debug_file;
+extern pthread_mutex_t print_mutex;
 
 void put_uint16(void *buf, u_int16_t val);
 void put_uint32(void *buf, u_int32_t val);

camogm_jpeg.c

@@ -76,8 +76,8 @@ int camogm_start_jpeg(camogm_state *state)
 				return -CAMOGM_FRAME_FILE_ERR;
 			}
 			D3(fprintf(debug_file, "Open raw device %s; start_pos = %llu, end_pos = %llu, curr_pos = %llu\n", state->rawdev.rawdev_path,
-					state->rawdev.start_pos, state->rawdev.end_pos, state->rawdev.curr_pos));
-			lseek64(state->rawdev.rawdev_fd, state->rawdev.curr_pos, SEEK_SET);
+					state->rawdev.start_pos, state->rawdev.end_pos, state->rawdev.curr_pos_w));
+			lseek64(state->rawdev.rawdev_fd, state->rawdev.curr_pos_w, SEEK_SET);
 		}
 	}
 
@@ -123,11 +123,11 @@ int camogm_frame_jpeg(camogm_state *state)
 		close(state->ivf);
 	} else {
 		D0(fprintf(debug_file, "\n%s: current pointers start_pos = %llu, end_pos = %llu, curr_pos = %llu, data in buffer %d\n", __func__,
-				state->rawdev.start_pos, state->rawdev.end_pos, state->rawdev.curr_pos, l));
+				state->rawdev.start_pos, state->rawdev.end_pos, state->rawdev.curr_pos_w, l));
 		split_index = -1;
 		for (int i = 0, total_len = 0; i < state->chunk_index - 1; i++) {
 			total_len += state->packetchunks[i + 1].bytes;
-			if (total_len + state->rawdev.curr_pos > state->rawdev.end_pos) {
+			if (total_len + state->rawdev.curr_pos_w > state->rawdev.end_pos) {
 				split_index = i;
 				chunks_used++;
 				D0(fprintf(debug_file, "\n>>> raw storage roll over detected\n"));
@@ -141,7 +141,7 @@ int camogm_frame_jpeg(camogm_state *state)
 			if (i == split_index) {
 				// one of the chunks rolls over the end of the raw storage, split it into two segments and
 				// use additional chunk in chunks_iovec for this additional segment
-				split_cntr = state->rawdev.end_pos - (l + state->rawdev.curr_pos);
+				split_cntr = state->rawdev.end_pos - (l + state->rawdev.curr_pos_w);
 				split_ptr = state->packetchunks[k].chunk + split_cntr;
 
 				D3(fprintf(debug_file, "Splitting chunk #%d: total chunk size = %ld, start address = 0x%p\n",
@@ -191,10 +191,10 @@ int camogm_frame_jpeg(camogm_state *state)
 			D0(fprintf(debug_file, "writev error %d (returned %d, expected %d)\n", j, iovlen, l));
 			return -CAMOGM_FRAME_FILE_ERR;
 		}
-		state->rawdev.curr_pos += l;
-		if (state->rawdev.curr_pos > state->rawdev.end_pos)
-			state->rawdev.curr_pos = state->rawdev.curr_pos - state->rawdev.end_pos + state->rawdev.start_pos;
-		D0(fprintf(debug_file, "%d bytes written, curr_pos = %llu\n", l, state->rawdev.curr_pos));
+		state->rawdev.curr_pos_w += l;
+		if (state->rawdev.curr_pos_w > state->rawdev.end_pos)
+			state->rawdev.curr_pos_w = state->rawdev.curr_pos_w - state->rawdev.end_pos + state->rawdev.start_pos;
+		D0(fprintf(debug_file, "%d bytes written, curr_pos = %llu\n", l, state->rawdev.curr_pos_w));
 	}
 
 	return 0;

camogm_read.c

@@ -214,6 +214,11 @@ struct crb_ptrs {
 	struct iovec        second_buff;
 };
 
+struct exit_state {
+	camogm_state *state;
+	int ret_val;
+};
+
 void dump_index_dir(const struct disk_idir *idir)
 {
 	struct disk_index *ind = idir->head;
@@ -680,6 +685,18 @@ static int write_buffer(struct file_opts *f_op, unsigned char *from, unsigned ch
 	return ret;
 }
 
+static inline void *exit_thread(void *arg)
+{
+	struct exit_state *s = (struct exit_state *)arg;
+
+	if (s->state->rawdev.rawdev_fd > 0) {
+		close(s->state->rawdev.rawdev_fd);
+		s->state->rawdev.rawdev_fd = -1;
+	}
+	s->state->rawdev.thread_finished = true;
+	return (void *) s->ret_val;
+}
+
 /**
  * @brief Extract JPEG files from raw device buffer
  *
@@ -687,9 +704,11 @@ static int write_buffer(struct file_opts *f_op, unsigned char *from, unsigned ch
  * analyzed for JPEG markers and then the data from buffer is written to a file.
  * @param[in]   state   a pointer to a structure containing current state
  * @return      0 if files were extracted successfully and negative error code otherwise
+ * @warning The main processing loop of the function is enclosed in @e pthread_cleanup_push and @e pthread_cleanup_pop
+ * calls. The effect of use of normal @b return or @b break to prematurely leave this loop is undefined.
  * @todo update description, reorder decision tree
  */
-int build_index(camogm_state *state)
+void *build_index(void *arg)
 {
 	const int include_markers = INCLUDE_MARKERS;
 	int process;
@@ -705,21 +724,22 @@ int build_index(camogm_state *state)
 	unsigned char *active_buff = buff;
 	unsigned char *save_from = NULL;
 	unsigned char *save_to = NULL;
-//	struct file_opts f_opts;
 	uint64_t dev_curr_pos = 0;
 	uint64_t include_st_marker, include_en_marker;
 	struct disk_idir index_dir = {0};
 	size_t add_stm_len, add_enm_len;
+	camogm_state *state = arg;
+	struct exit_state exit_state = {
+			.state = state,
+			.ret_val = 0
+	};
 
-//	memset(&f_opts, 0, sizeof(struct file_opts));
-//	f_opts.file_state = WRITE_STOP;
-//	f_opts.state = state;
-//
 	state->rawdev.rawdev_fd = open(state->rawdev.rawdev_path, O_RDONLY);
 	if (state->rawdev.rawdev_fd < 0) {
 		D0(perror(__func__));
 		D0(fprintf(debug_file, "Error opening raw device %s\n", state->rawdev.rawdev_path));
-		return -CAMOGM_FRAME_FILE_ERR;
+		exit_state.ret_val = -CAMOGM_FRAME_FILE_ERR;
+		exit_thread(&exit_state);
 	}
 
 	if (include_markers) {
@@ -738,6 +758,7 @@ int build_index(camogm_state *state)
 	zero_cross = 0;
 	search_state = SEARCH_SKIP;
 	idir_result = 0;
+	pthread_cleanup_push(exit_thread, &exit_state);
 	while (process) {
 		rd = read(state->rawdev.rawdev_fd, buff, sizeof(buff));
 		err = errno;
@@ -813,7 +834,6 @@ int build_index(camogm_state *state)
 					// normal condition, start marker following stop marker found - this indicates a new file
 					uint64_t disk_pos = dev_curr_pos + pos_stop + (save_from - active_buff);
 					idir_result = stop_index(&index_dir, disk_pos);
-					dump_index_dir(&index_dir);
 					if (zero_cross == 0) {
 						state->rawdev.file_start = dev_curr_pos + pos_start + (save_from - active_buff);
 						idir_result = save_index(state, &index_dir);
@@ -893,18 +913,23 @@ int build_index(camogm_state *state)
 				process = 0;
 			}
 			dev_curr_pos += rd;
+			state->rawdev.curr_pos_r = dev_curr_pos;
 		}
 	}
+	pthread_cleanup_pop(0);
 
 	D0(fprintf(debug_file, "\n%d files read from %s\n", index_dir.size, state->rawdev.rawdev_path));
 
 	if (close(state->rawdev.rawdev_fd) != 0) {
 		perror("Unable to close raw device: ");
-		return -CAMOGM_FRAME_FILE_ERR;
+		exit_state.ret_val = -CAMOGM_FRAME_FILE_ERR;
+		exit_thread(&exit_state);
 	}
+	state->rawdev.rawdev_fd = -1;
 
 	dump_index_dir(&index_dir);
 	delete_idir(&index_dir);
 
-	return 0;
+	exit_state.ret_val = 0;
+	exit_thread(&exit_state);
 }

camogm_read.h

@@ -35,7 +35,6 @@ struct disk_idir {
 	size_t size;
 };
 
-//int camogm_read(camogm_state *state);
-int build_index(camogm_state *state);
+void *build_index(void *arg);
 
 #endif /* _CAMOGM_READ_H */