Fix linking error in CMake and divide by zero error in perf tests

CMakeLists.txt

@@ -29,11 +29,14 @@ include_directories(${PROJECT_SOURCE_DIR} "${PROJECT_SOURCE_DIR}/dns")
 set_source_files_properties(dns/dns.c PROPERTIES COMPILE_FLAGS -std=c99)
 add_library(dill ${sources})
 
+find_package(Threads REQUIRED)
+target_link_libraries(dill PUBLIC Threads::Threads)
+
 # check and enable rt if available
 list(APPEND CMAKE_REQUIRED_LIBRARIES rt)
 check_symbol_exists(clock_gettime time.h HAVE_CLOCK_GETTIME)
 if(HAVE_CLOCK_GETTIME)
-  target_link_libraries(dill rt)
+  target_link_libraries(dill PUBLIC rt)
 endif()
 
 # Installation (https://github.com/forexample/package-example)
@@ -118,12 +121,12 @@ set(CMAKE_REQUIRED_DEFINITIONS )
 
 check_function_exists(mprotect HAVE_MPROTECT)
 if(HAVE_MPROTECT)
-  add_definitions(-DHAVE_MPROTECT)
+  target_compile_definitions(dill PUBLIC HAVE_MPROTECT)
 endif()
 
 check_function_exists(posix_memalign HAVE_POSIX_MEMALIGN)
 if(HAVE_POSIX_MEMALIGN)
-  add_definitions(-DHAVE_POSIX_MEMALIGN)
+  target_compile_definitions(dill PUBLIC HAVE_POSIX_MEMALIGN)
 endif()
 
 # tests

perf/chan.c

@@ -65,8 +65,10 @@ int main(int argc, char *argv[]) {
     printf("done %ldM roundtrips in %f seconds\n",
         (long)(count / 1000000), ((float)duration) / 1000);
     printf("duration of passing a single message: %ld ns\n", ns);
-    printf("message passes per second: %fM\n",
-        (float)(1000000000 / ns) / 1000000);
+    if (ns > 0) {
+      printf("message passes per second: %fM\n",
+          (float)(1000000000 / ns) / 1000000);
+    }
 
     return 0;
 }

perf/choose.c

@@ -67,8 +67,10 @@ int main(int argc, char *argv[]) {
     printf("done %ldM roundtrips in %f seconds\n",
         (long)(count / 1000000), ((float)duration) / 1000);
     printf("duration of passing a single message: %ld ns\n", ns);
-    printf("message passes per second: %fM\n",
+    if (ns > 0) {
+      printf("message passes per second: %fM\n",
         (float)(1000000000 / ns) / 1000000);
+    }
 
     return 0;
 }

perf/ctxswitch.c

@@ -57,8 +57,10 @@ int main(int argc, char *argv[]) {
     printf("performed %ldM context switches in %f seconds\n",
         (long)(count * 2 / 1000000), ((float)duration) / 1000);
     printf("duration of one context switch: %ld ns\n", ns);
-    printf("context switches per second: %fM\n",
+    if (ns > 0) {
+      printf("context switches per second: %fM\n",
         (float)(1000000000 / ns) / 1000000);
+    }
 
     return 0;
 }

perf/go.c

@@ -55,8 +55,10 @@ int main(int argc, char *argv[]) {
     printf("executed %ldM coroutines in %f seconds\n",
         (long)(count / 1000000), ((float)duration) / 1000);
     printf("duration of one coroutine creation+termination: %ld ns\n", ns);
-    printf("coroutine creations+terminations per second: %fM\n",
-        (float)(1000000000 / ns) / 1000000);
+    if (ns > 0) {
+      printf("coroutine creations+terminations per second: %fM\n",
+          (float)(1000000000 / ns) / 1000000);
+    }
 
     return 0;
 }

perf/hdone.c

@@ -65,8 +65,10 @@ int main(int argc, char *argv[]) {
     printf("done %ldM coroutine/channel cancellations in %f seconds\n",
         (long)(count / 1000000), ((float)duration) / 1000);
     printf("duration of coroutine/channel cancellation: %ld ns\n", ns);
-    printf("coroutine/channel cancellations per second: %fM\n",
-        (float)(1000000000 / ns) / 1000000);
+    if (ns > 0) {
+      printf("coroutine/channel cancellations per second: %fM\n",
+          (float)(1000000000 / ns) / 1000000);
+    }
 
     return 0;
 }

perf/whispers.c

@@ -68,8 +68,10 @@ int main(int argc, char *argv[]) {
     printf("took %f seconds\n", (float)duration / 1000);
     printf("performed %ld whispers in %f seconds\n", count, ((float)duration) / 1000);
     printf("duration of one whisper: %ld ns\n", ns);
-    printf("whispers per second: %fM\n",
+    if (ns > 0) {
+      printf("whispers per second: %fM\n",
         (float)(1000000000 / ns) / 1000000);
+    }
 
     return 0;
 }