add two multiprocess commands

package/Config.in

@@ -2189,6 +2189,11 @@ menu "Miscellaneous"
 	source "package/xutil_util-macros/Config.in"
 endmenu
 
+menu "MULTIPROCESS Packages"
+	source "package/pth_hello/Config.in"
+	source "package/thread_sum/Config.in"
+endmenu
+
 menu "Networking applications"
 	source "package/aircrack-ng/Config.in"
 	source "package/alfred/Config.in"

package/pth_hello/Config.in

@@ -0,0 +1,5 @@
+config BR2_PACKAGE_PTH_HELLO
+    bool "pth_hello"
+    help
+        pth_hello package.
+

package/pth_hello/pth_hello.mk

@@ -0,0 +1,19 @@
+################################################################################
+#
+# pth_hello package
+#
+################################################################################
+
+PTH_HELLO_VERSION = 1.0
+PTH_HELLO_SITE = package/pth_hello/src
+PTH_HELLO_SITE_METHOD = local# Other methods like git,wget,scp,file etc. are also available.
+
+define PTH_HELLO_BUILD_CMDS
+	$(MAKE) CC="$(TARGET_CC)" LD="$(TARGET_LD)" -C $(@D)
+endef
+
+define PTH_HELLO_INSTALL_TARGET_CMDS
+	$(INSTALL) -D -m 0755 $(@D)/pth_hello  $(TARGET_DIR)/usr/bin
+endef
+
+$(eval $(generic-package))

package/pth_hello/src/Makefile

@@ -0,0 +1,8 @@
+.PHONY: clean
+.PHONY: pth_hello
+
+pth_hello: pth_hello.c
+	$(CC) -o '$@' '$<' -lpthread
+
+clean:
+	-rm pth_hello

package/pth_hello/src/pth_hello.c

@@ -0,0 +1,39 @@
+#include <stdio.h>
+#include <stdlib.h>
+#include <pthread.h>
+
+/* Global variable: accessible to all threads */
+int thread_count;
+
+void* Hello(void* rank); // Thread function
+
+int main(int argc, char* argv[]){
+    long        thread;
+    pthread_t*  thread_handles;
+
+    /* Get number of threads from command line */
+    thread_count = strtol(argv[1], NULL, 10);
+
+    thread_handles = malloc(thread_count*sizeof(pthread_t));
+
+    for (thread = 0; thread < thread_count; thread++)
+        pthread_create(&thread_handles[thread], NULL,
+            Hello, (void*) thread);
+
+    printf("Hello from the main thread\n");
+
+    for (thread = 0; thread < thread_count; thread++)
+        pthread_join(thread_handles[thread], NULL);
+
+    free(thread_handles);
+
+    return 0;
+} /* main */
+
+void* Hello(void* rank){
+    long my_rank = (long) rank;
+
+    printf("Hello from thread %ld of %d\n", my_rank, thread_count);
+
+    return NULL;
+} /* Hello */

package/thread_sum/Config.in

@@ -0,0 +1,5 @@
+config BR2_PACKAGE_THREAD_SUM
+    bool "thread_sum"
+    help
+        thread_sum package.
+

package/thread_sum/src/Makefile

@@ -0,0 +1,8 @@
+.PHONY: clean
+.PHONY: thread_sum
+
+thread_sum: thread_sum.c
+	$(CC) -o '$@' '$<' -lpthread
+
+clean:
+	-rm thread_sum

package/thread_sum/src/thread_sum.c

@@ -0,0 +1,65 @@
+#include <stdio.h>
+#include <stdlib.h>
+#include <pthread.h>
+
+/* Global variable: accessible to all threads */
+int thread_count;
+long long n;
+double sum;
+pthread_mutex_t mutex;
+
+void* Thread_sum(void* rank); // Thread function
+
+int main(int argc, char* argv[]){
+    long        thread;
+    pthread_t*  thread_handles;
+
+		pthread_mutex_init( &mutex, NULL );
+
+    /* Get number of threads from command line */
+    thread_count = strtol(argv[1], NULL, 10);
+
+    thread_handles = malloc(thread_count*sizeof(pthread_t));
+
+		printf("Thread_sum from the main thread\n");
+		for ( n = 1e5; n <= 1e10; n *= 10, sum = 0 ) {
+		    for (thread = 0; thread < thread_count; thread++)
+		        pthread_create(&thread_handles[thread], NULL,
+		            Thread_sum, (void*) thread);
+
+		    for (thread = 0; thread < thread_count; thread++)
+		        pthread_join(thread_handles[thread], NULL);
+				printf("pi = %.11f @ n = %lld\n", 4.0*sum, n);
+		}
+
+		pthread_mutex_destroy( &mutex );
+
+    free(thread_handles);
+
+    return 0;
+} /* main */
+
+void* Thread_sum(void* rank){
+	  long my_rank = (long) rank;
+
+	  double factor;
+	  long long i;
+	  long long my_n = n/thread_count;
+	  long long my_first_i = my_n * my_rank;
+	  long long my_last_i = my_first_i + my_n;
+	  double my_sum = 0.0;
+
+	  if (my_first_i % 2 == 0)
+	    	factor = 1.0;
+	  else
+	    	factor = -1.0;
+
+	  for (i = my_first_i; i < my_last_i; i++, factor = -factor)
+	    	my_sum += factor/(2*i+1);
+
+	  pthread_mutex_lock(&mutex);
+	  sum += my_sum;
+	  pthread_mutex_unlock(&mutex);
+
+	  return NULL;
+} /* Thread_sum */

package/thread_sum/thread_sum.mk

@@ -0,0 +1,19 @@
+################################################################################
+#
+# thread_sum package
+#
+################################################################################
+
+THREAD_SUM_VERSION = 1.0
+THREAD_SUM_SITE = package/thread_sum/src
+THREAD_SUM_SITE_METHOD = local# Other methods like git,wget,scp,file etc. are also available.
+
+define THREAD_SUM_BUILD_CMDS
+	$(MAKE) CC="$(TARGET_CC)" LD="$(TARGET_LD)" -C $(@D)
+endef
+
+define THREAD_SUM_INSTALL_TARGET_CMDS
+	$(INSTALL) -D -m 0755 $(@D)/thread_sum  $(TARGET_DIR)/usr/bin
+endef
+
+$(eval $(generic-package))