Diff: main.cpp

Revision:

0:9a66107976a4

Child:

1:8289e2db9449

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/main.cpp	Sun Jan 06 14:34:08 2013 +0000
@@ -0,0 +1,121 @@
+#include "mbed.h"
+#include "cmsis_os.h"
+
+#define NUM_THREADS  3
+#define TCOUNT 10
+#define COUNT_LIMIT 12
+
+int     count = 0;
+osMutexId count_mutex;
+osMutexDef(count_mutex);
+
+struct thread_data
+{
+    osThreadId id;
+    long  my_id;
+};
+
+struct thread_data thread_data_array[NUM_THREADS-1];
+Serial debug(USBTX, USBRX);
+
+void inc_count(void const *threadarg)
+{
+    int i;
+    long my_id;
+    osThreadId id;
+    struct thread_data *my_data;
+    my_data = (struct thread_data *) threadarg;
+    id = my_data->id;
+    my_id = my_data->my_id;
+
+    for (i=0; i < TCOUNT; i++) {
+        osMutexWait(count_mutex, osWaitForever);
+        count++;
+
+        /*
+    Check the value of count and signal waiting thread when condition is
+    reached.  Note that this occurs while mutex is locked.
+         */
+        if (count == COUNT_LIMIT) {
+            printf("inc_count(): thread %ld, count = %d  Threshold reached. ",
+                    my_id, count);
+            osSignalSet(id, 0x1);
+            printf("Just sent signal.\n");
+        }
+        printf("inc_count(): thread %ld, count = %d, unlocking mutex\n",
+                my_id, count);
+        osMutexRelease(count_mutex);
+
+        /* Do some work so threads can alternate on mutex lock */
+        osDelay(1000);
+    }
+    id = osThreadGetId();
+    osThreadTerminate(id);
+}
+
+void watch_count(void const *t)
+{
+    osThreadId id;
+    long my_id = (long)t;
+
+    printf("Starting watch_count(): thread %ld\n", my_id);
+
+    //osMutexWait(count_mutex, osWaitForever);
+    while (count < COUNT_LIMIT) {
+        //osMutexRelease(count_mutex);
+        printf("watch_count(): thread %ld Count= %d. Going into wait...\n", my_id,count);
+        osSignalWait(0x1, osWaitForever);
+        //osMutexWait(count_mutex, osWaitForever);
+        printf("watch_count(): thread %ld Condition signal received. Count= %d\n", my_id,count);
+        printf("watch_count(): thread %ld Updating the value of count...\n", my_id);
+        count += 125;
+        printf("watch_count(): thread %ld count now = %d.\n", my_id, count);
+        //osMutexRelease(count_mutex);
+    }
+    printf("watch_count(): thread %ld Unlocking mutex.\n", my_id);
+    //osMutexRelease(count_mutex);
+    id = osThreadGetId();
+    osThreadTerminate(id);
+}
+
+void th0(void const *argument) {watch_count(argument);}
+osThreadDef(th0, osPriorityNormal, DEFAULT_STACK_SIZE);
+
+void th1(void const *argument) {inc_count(argument);}
+osThreadDef(th1, osPriorityNormal, DEFAULT_STACK_SIZE);
+
+void th2(void const *argument) {inc_count(argument);}
+osThreadDef(th2, osPriorityNormal, DEFAULT_STACK_SIZE);
+
+int main(int argc, char *argv[])
+{
+    debug.baud(57600);
+    long t1=1, t2=2, t3=3;
+    osThreadId id;
+
+
+    /* Initialize mutex and condition variable objects */
+    count_mutex = osMutexCreate(osMutex(count_mutex));
+
+    /* For portability, explicitly create threads in a joinable state */
+
+    id = osThreadCreate(osThread(th0), (void *)t1);
+    
+    thread_data_array[0].id = id;
+    thread_data_array[0].my_id = t2;
+        thread_data_array[1].id = id;
+    thread_data_array[1].my_id = t3;
+    
+    osThreadCreate(osThread(th1), (void *)&thread_data_array[0]);
+    
+
+    osThreadCreate(osThread(th2), (void *)&thread_data_array[1]);
+
+    /* Wait for all threads to complete */
+
+    printf ("Main(): Waited and joined with %d threads. Final value of count = %d. Done.\n",
+            NUM_THREADS, count);
+
+
+
+}
\ No newline at end of file