Ye Cheng
cmsis rtos demo: mutex
Revision 0:fba50ae123e6, committed 2013-01-06
- Comitter:
- cnhzcy14
- Date:
- Sun Jan 06 14:20:05 2013 +0000
- Child:
- 1:1308d7d6d53e
- Commit message:
- cmsis demo
Changed in this revision
--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/main.cpp Sun Jan 06 14:20:05 2013 +0000
@@ -0,0 +1,101 @@
+#include "mbed.h"
+#include "cmsis_os.h"
+
+Serial debug(USBTX, USBRX);
+
+typedef struct
+{
+ double *a;
+ double *b;
+ double sum;
+ int veclen;
+} DOTDATA;
+
+#define NUMTHRDS 4
+#define VECLEN 200
+DOTDATA dotstr;
+osMutexId stdio_mutex;
+osMutexDef(stdio_mutex);
+
+
+
+void dotprod(void const *arg)
+{
+ osThreadId id;
+ int i, start, end, len ;
+ long offset;
+ double mysum, *x, *y;
+ offset = (long)arg;
+
+ len = dotstr.veclen;
+ start = offset*len;
+ end = start + len;
+ x = dotstr.a;
+ y = dotstr.b;
+
+ mysum = 0;
+ for (i=start; i<end ; i++)
+ {
+ mysum += (x[i] * y[i]);
+ }
+
+ osMutexWait(stdio_mutex, osWaitForever);
+ dotstr.sum += mysum;
+ printf("Thread %ld did %d to %d: mysum=%f global sum=%f\n",offset,start,end,mysum,dotstr.sum);
+ osMutexRelease(stdio_mutex);
+
+ id = osThreadGetId();
+ osThreadTerminate(id);
+}
+
+
+void t0(void const *argument) {dotprod(argument);}
+osThreadDef(t0, osPriorityNormal, DEFAULT_STACK_SIZE);
+
+void t1(void const *argument) {dotprod(argument);}
+osThreadDef(t1, osPriorityNormal, DEFAULT_STACK_SIZE);
+
+void t2(void const *argument) {dotprod(argument);}
+osThreadDef(t2, osPriorityNormal, DEFAULT_STACK_SIZE);
+
+void t3(void const *argument) {dotprod(argument);}
+osThreadDef(t3, osPriorityNormal, DEFAULT_STACK_SIZE);
+
+int main() {
+ debug.baud(57600);
+
+ long i;
+ double *a, *b;
+ //void *status;
+
+ /* Assign storage and initialize values */
+
+ a = (double*) malloc (NUMTHRDS*VECLEN*sizeof(double));
+ b = (double*) malloc (NUMTHRDS*VECLEN*sizeof(double));
+
+ for (i=0; i<VECLEN*NUMTHRDS; i++) {
+ a[i]=1;
+ b[i]=a[i];
+ }
+
+ dotstr.veclen = VECLEN;
+ dotstr.a = a;
+ dotstr.b = b;
+ dotstr.sum=0;
+
+ stdio_mutex = osMutexCreate(osMutex(stdio_mutex));
+
+ for(i=0;i<NUMTHRDS;i++)
+ {
+ if(i==0) osThreadCreate(osThread(t0), (void *)i);
+ if(i==1) osThreadCreate(osThread(t1), (void *)i);
+ if(i==2) osThreadCreate(osThread(t2), (void *)i);
+ if(i==3) osThreadCreate(osThread(t3), (void *)i);
+ }
+
+ printf ("Sum = %f \n", dotstr.sum);
+ free (a);
+ free (b);
+}
+
+
--- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/mbed-rtos.lib Sun Jan 06 14:20:05 2013 +0000 @@ -0,0 +1,1 @@ +http://mbed.org/users/mbed_official/code/mbed-rtos/#88a1a9c26ae3
--- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/mbed.bld Sun Jan 06 14:20:05 2013 +0000 @@ -0,0 +1,1 @@ +http://mbed.org/users/mbed_official/code/mbed/builds/63cdd78b2dc1 \ No newline at end of file