From 20aff761e64ac07fbfb8a76f4bb4346b64294cb7 Mon Sep 17 00:00:00 2001
From: LongHairedHacker <sebastian@sebastians-site.de>
Date: Wed, 30 Nov 2016 22:47:26 +0100
Subject: [PATCH] Added threads and mutexes for eventloop

---
 software/linux/.gitignore          |   1 +
 software/linux/Makefile            |   4 +-
 software/linux/bin/libsss7.so      | Bin 13352 -> 0 bytes
 software/linux/bin/sss7core/sss7.o | Bin 4384 -> 0 bytes
 software/linux/bin/test            | Bin 13064 -> 0 bytes
 software/linux/bin/test.o          | Bin 1240 -> 0 bytes
 software/linux/libsss7.c           |  87 +++++++++++++++++++++++------
 software/linux/libsss7.h           |   5 +-
 software/linux/test.c              |  33 ++++++++++-
 software/sss7core/sss7.c           |   6 +-
 software/sss7core/sss7.h           |  12 +++-
 11 files changed, 119 insertions(+), 29 deletions(-)
 create mode 100644 software/linux/.gitignore
 delete mode 100755 software/linux/bin/libsss7.so
 delete mode 100644 software/linux/bin/sss7core/sss7.o
 delete mode 100755 software/linux/bin/test
 delete mode 100644 software/linux/bin/test.o

diff --git a/software/linux/.gitignore b/software/linux/.gitignore
new file mode 100644
index 0000000..ba077a4
--- /dev/null
+++ b/software/linux/.gitignore
@@ -0,0 +1 @@
+bin
diff --git a/software/linux/Makefile b/software/linux/Makefile
index 200be47..2785700 100644
--- a/software/linux/Makefile
+++ b/software/linux/Makefile
@@ -5,8 +5,8 @@ OBJDIR = bin
 
 CC = clang
 
-CFLAGS = -I ../sss7core/ -Os -Wall -Wstrict-prototypes -fPIC
-LDFLAGS = -Wl,--gc-sections
+CFLAGS =  -I ../sss7core/ -Os -Wall -Wstrict-prototypes -fPIC
+LDFLAGS = -pthread -Wl,--gc-sections
 
 all: start $(OBJDIR)/libsss7.so $(OBJDIR)/test
 	@echo ":: Done !"
diff --git a/software/linux/bin/libsss7.so b/software/linux/bin/libsss7.so
deleted file mode 100755
index a314a4ba36b2cade606131e6568ef454b758c5af..0000000000000000000000000000000000000000
GIT binary patch
literal 0
HcmV?d00001

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diff --git a/software/linux/bin/sss7core/sss7.o b/software/linux/bin/sss7core/sss7.o
deleted file mode 100644
index b7b5f5f311253f38b75ad99e142b6c32487f468e..0000000000000000000000000000000000000000
GIT binary patch
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diff --git a/software/linux/bin/test b/software/linux/bin/test
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diff --git a/software/linux/bin/test.o b/software/linux/bin/test.o
deleted file mode 100644
index 15f97f59398ea80a7f6e7ea9f6402acfce5f7329..0000000000000000000000000000000000000000
GIT binary patch
literal 0
HcmV?d00001

literal 1240
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diff --git a/software/linux/libsss7.c b/software/linux/libsss7.c
index ea0fd6a..27252e9 100644
--- a/software/linux/libsss7.c
+++ b/software/linux/libsss7.c
@@ -6,15 +6,20 @@
 #include <fcntl.h>
 #include <errno.h>
 #include <termios.h>
+#include <pthread.h>
+
+#include "sss7.h"
+
 
 uint8_t uart_rx_byte;
-uint8_t uart_tx_byte, uart_has_tx_byte;
+_Atomic uint8_t uart_tx_byte, uart_has_tx_byte, uart_tx_done;
+
+pthread_t event_thread;
+pthread_mutex_t state_mutex, rx_buffer_mutex;
 
 int serial_fd;
 
-int libsss7_start(char *serialport) {
-	sss7_init();
-
+int uart_init(char *serialport) {
 	serial_fd = open(serialport, O_RDWR | O_NOCTTY | O_NDELAY);
 	if (serial_fd == -1) {
 	  perror("Error: Unable to open serialport");
@@ -45,18 +50,30 @@ int libsss7_start(char *serialport) {
 	options.c_cc[VMIN] = 0;
 	tcsetattr(serial_fd, TCSAFLUSH, &options);
 
-	int res = 0;
-	while(1) {
-		res = read(serial_fd, &uart_rx_byte, 1);
-		if(res == 1) {
-			sss7_process_rx();
-		}
+	return 0;
+}
 
-		if(uart_has_tx_byte) {
-			uart_has_tx_byte = 0;
-			write(serial_fd, &uart_has_tx_byte, 1);
-			sss7_process_tx();
-		}
+void *eventloop(void *arg);
+
+int libsss7_start(char *serialport) {
+	int res = 0;
+
+	sss7_init();
+	res = uart_init(serialport);
+	if(res) {
+		return -1;
+	}
+
+	uart_has_tx_byte = 0;
+	uart_tx_done = 0;
+
+	pthread_mutex_init(&state_mutex, NULL);
+	pthread_mutex_init(&rx_buffer_mutex, NULL);
+
+	res = pthread_create(&event_thread, NULL, eventloop, NULL);
+	if(res) {
+		printf("Could not create eventloop thread\n");
+		return -1;
 	}
 
 	return 0;
@@ -67,7 +84,9 @@ int libsss7_can_send(void) {
 }
 
 void libsss7_send(uint8_t msg[SSS7_PAYLOAD_SIZE]) {
-
+	pthread_mutex_lock(&state_mutex);
+	sss7_send(msg);
+	pthread_mutex_unlock(&state_mutex);
 }
 
 int libsss7_send_failed(void) {
@@ -79,10 +98,14 @@ int libsss7_has_received(void) {
 }
 
 void libsss7_get_received(uint8_t msg[SSS7_PAYLOAD_SIZE]) {
-	return sss7_get_received(msg);
+	pthread_mutex_lock(&rx_buffer_mutex);
+	sss7_get_received(msg);
+	pthread_mutex_unlock(&rx_buffer_mutex);
 }
 
 void libsss7_stop() {
+	pthread_join(event_thread, NULL);
+
 	close(serial_fd);
 }
 
@@ -94,3 +117,33 @@ void uart_put_byte(uint8_t byte) {
 	uart_has_tx_byte = 1;
 	uart_tx_byte = byte;
 }
+
+void *eventloop(void *arg) {
+	int res = 0;
+	while(1) {
+		if(uart_has_tx_byte) {
+			write(serial_fd, &uart_tx_byte, 1);
+			printf("Send %x\n", uart_tx_byte);
+			uart_has_tx_byte = 0;
+			uart_tx_done = 1;
+		}
+
+		res = read(serial_fd, &uart_rx_byte, 1);
+		if(res == 1) {
+			pthread_mutex_lock(&state_mutex);
+			pthread_mutex_lock(&rx_buffer_mutex);
+			sss7_process_rx();
+			pthread_mutex_unlock(&rx_buffer_mutex);
+			pthread_mutex_unlock(&state_mutex);
+		}
+
+		if(uart_tx_done) {
+			uart_tx_done = 0;
+			pthread_mutex_lock(&state_mutex);
+			sss7_process_tx();
+			pthread_mutex_unlock(&state_mutex);
+		}
+	}
+
+	return NULL;
+}
diff --git a/software/linux/libsss7.h b/software/linux/libsss7.h
index e26f3ac..e2564b6 100644
--- a/software/linux/libsss7.h
+++ b/software/linux/libsss7.h
@@ -3,18 +3,17 @@
 
 #include "sss7.h"
 
-
 int libsss7_start(char *serialport);
 
 int libsss7_can_send(void);
 
-void libsss7_send(uint8_t msg[SSS7_PAYLOAD_SIZE]);
+void libsss7_send(uint8_t *msg);
 
 int libsss7_send_failed(void);
 
 int libsss7_has_received(void);
 
-void libsss7_get_received(uint8_t msg[SSS7_PAYLOAD_SIZE]);
+void libsss7_get_received(uint8_t *msg);
 
 void libsss7_stop();
 
diff --git a/software/linux/test.c b/software/linux/test.c
index 7374678..a0c8185 100644
--- a/software/linux/test.c
+++ b/software/linux/test.c
@@ -1,10 +1,41 @@
 #include <stdio.h>
 #include <stdint.h>
+#include <string.h>
+#include <unistd.h>
 
 #include "libsss7.h"
 
 int main(int argc, char const *argv[]) {
-	libsss7_start("/tmp/ttyVA");
+	libsss7_start("/dev/ttyUSB0");
+
+	uint8_t msg[SSS7_PAYLOAD_SIZE];
+    memset(msg, 0, SSS7_PAYLOAD_SIZE);
+    msg[0] = 'H';
+    msg[1] = 'e';
+    msg[2] = 'l';
+    msg[3] = 'l';
+    msg[4] = 'o';
+    msg[5] = ' ';
+    msg[6] = 'W';
+    msg[7] = 'o';
+    msg[8] = 'r';
+    msg[9] = 'l';
+    msg[10] = 'd';
+
+
+    while(1) {
+
+        while(!libsss7_can_send());
+        libsss7_send(msg);
+        while(!libsss7_can_send());
+        if(libsss7_send_failed()) {
+			printf("Send failed\n");
+        }
+        sleep(2);
+    }
+
+
+	libsss7_send(msg);
 
 	libsss7_stop();
 	return 0;
diff --git a/software/sss7core/sss7.c b/software/sss7core/sss7.c
index 5906a7a..4dc58ca 100644
--- a/software/sss7core/sss7.c
+++ b/software/sss7core/sss7.c
@@ -2,7 +2,7 @@
 
 #include <string.h>
 
-volatile enum sss7State sss7_state;
+sss7_shared_modfier enum sss7State sss7_state;
 
 uint8_t sss7_rx_buffer[SSS7_RX_BUFFER_SIZE][SSS7_PAYLOAD_SIZE];
 uint8_t sss7_rx_buffer_write;
@@ -12,11 +12,11 @@ uint8_t sss7_rx_pos;
 uint8_t sss7_tx_buffer[SSS7_PAYLOAD_SIZE];
 uint8_t sss7_tx_pos;
 uint8_t sss7_tx_crc;
-volatile uint8_t sss7_tx_failed;
+sss7_shared_modfier uint8_t sss7_tx_failed;
 uint8_t sss7_tx_last_byte;
 uint8_t sss7_tx_last_ack;
 
-volatile uint8_t sss7_timeout_counter;
+sss7_shared_modfier uint8_t sss7_timeout_counter;
 
 
 void sss7_init(void) {
diff --git a/software/sss7core/sss7.h b/software/sss7core/sss7.h
index e8e0d20..db18204 100644
--- a/software/sss7core/sss7.h
+++ b/software/sss7core/sss7.h
@@ -5,9 +5,14 @@
 extern "C" {
 #endif
 
-
 #include <stdint.h>
 
+#ifndef sss7_shared_modfier
+#define sss7_shared_modfier volatile
+#endif
+
+
+
 enum sss7State {
 	SSS7_IDLE,
 	SSS7_TX_HEADER,
@@ -27,11 +32,12 @@ const static uint16_t sss7_timeout_increment = 1;
 #define SSS7_RX_BUFFER_SIZE 2
 
 
-extern volatile enum sss7State sss7_state;
-extern volatile uint8_t sss7_tx_failed;
+extern sss7_shared_modfier enum sss7State sss7_state;
+extern sss7_shared_modfier uint8_t sss7_tx_failed;
 extern uint8_t sss7_rx_buffer_write;
 extern uint8_t sss7_rx_buffer_read;
 
+
 void sss7_process_rx(void);
 void sss7_process_tx(void);
 void sss7_process_ticks(uint16_t ticks);