Intial commit of source code samples for GitHub repo.

openmp-c/Makefile

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+# Sample makefile to add version/compiler info via an extra
+# object module linked to final binary.
+#
+COMPILER_VER:=$(shell gcc --version)
+COMPILER_OPTS=-fopenmp
+GIT_DESCRIBE:=$(shell git describe --abbrev=7 --dirty --always --tags --long)
+
+.PHONY: all
+all:    hello-omp
+  
+versioninfo.txt:
+	@echo "@(#) Compiler version: ${COMPILER_VER}." >versioninfo.txt
+	@echo "@(#) Compiler options: ${COMPILER_OPTS}." >>versioninfo.txt
+	@echo "@(#) Git info: ${GIT_DESCRIBE}" >>versioninfo.txt
+        
+versioninfo.o:  versioninfo.txt
+	objcopy --input binary \
+		--output elf64-x86-64 \
+		--binary-architecture i386 \
+		--add-section versioninfo=versioninfo.txt \
+		--set-section-flags versioninfo=contents,noload \
+		versioninfo.txt versioninfo.o
+
+hello-omp:  hello-omp.c Makefile versioninfo.o
+	gcc $(COMPILER_OPTS) -DVERSIONINFO="\"$(GIT_DESCRIBE)\"" hello-omp.c \
+		versioninfo.o -o hello-omp
+
+.PHONY: test
+test:
+	(export OMP_NUM_THREADS=2; ./hello-omp)
+	sleep 5
+	(export OMP_NUM_THREADS=24; ./hello-omp)
+	sleep 5
+	(export OMP_NUM_THREADS=500; ./hello-omp)
+
+.PHONY: clean
+clean:
+	rm -f hello-omp	versioninfo.*

openmp-c/hello-omp.c

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+#include <omp.h>
+#include <stdio.h>
+
+#ifdef _OPENMP
+
+static char versionbuf[16];
+static char gitversion[] = VERSIONINFO;
+
+int main()
+{
+	int tcount = 0;
+	char *versionp;
+
+	/* Tell about the version of OpenMP API we're using.
+	 * Specification source: www.openmp.org.
+	*/
+	switch (_OPENMP) {
+		case 200805:
+			versionp = "3.0 (May 2008)"; break;
+		case 201107:
+			versionp = "3.1 (Jul 2011)"; break;
+		case 201307:
+			versionp = "4.0 (Jul 2013)"; break;
+		default:
+			sprintf(versionbuf, "(%6.6d)", _OPENMP); 
+			versionp = versionbuf;
+			break;
+	}
+	printf("Using OpenMP version: %s\n", versionp);
+	printf("Program git commit info: %s\n", gitversion);
+	printf("Max threads = %d\n", omp_get_max_threads());
+
+#pragma omp parallel
+#pragma omp atomic
+	tcount++;
+
+#pragma omp parallel
+	/* Hello parallel world... */
+	printf("Hello OpenMP World from thread %3.3d of %3.3d! (tcount=%d)\n",
+		omp_get_thread_num() + 1, omp_get_num_threads(), tcount);
+}
+
+#endif

openmp-c/versioninfo.txt

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+@(#) Compiler version: gcc (GCC) 4.8.2 20140120 (Red Hat 4.8.2-16) Copyright (C) 2013 Free Software Foundation, Inc. This is free software; see the source for copying conditions.  There is NO warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE..
+@(#) Compiler options: -fopenmp.
+@(#) Git info: e1e14b8-dirty