fallback to usleep

scivision · Jan 31, 2025 · 9179c6a · 9179c6a
1 parent 03d22f3
commit 9179c6a
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Showing 3 changed files with 26 additions and 42 deletions.
diff --git a/CMakeLists.txt b/CMakeLists.txt
@@ -1,4 +1,4 @@
-cmake_minimum_required(VERSION 3.15...3.29)
+cmake_minimum_required(VERSION 3.15...3.31)
 
 if(CMAKE_SOURCE_DIR STREQUAL CMAKE_BINARY_DIR)
   message(FATAL_ERROR "use out-of-source build
@@ -11,20 +11,17 @@ LANGUAGES C CXX Fortran
 
 enable_testing()
 
-set(CMAKE_CXX_STANDARD 11)
+include(CheckSymbolExists)
 
-include(cmake/compilers.cmake)
-
-include(CheckPIESupported)
-check_pie_supported()
-set(CMAKE_POSITION_INDEPENDENT_CODE true)
+check_symbol_exists(nanosleep "time.h" HAVE_NANOSLEEP)
 
 # --- RECOMMENDED: sleep_ms() using C++ stdlib
 
 add_library(sleep_std OBJECT src/sleep_std.f90)
 set_property(TARGET sleep_std PROPERTY Fortran_MODULE_DIRECTORY ${CMAKE_CURRENT_BINARY_DIR}/include)
 
 add_library(sleep_cpp src/sleep.cpp $<TARGET_OBJECTS:sleep_std>)
+target_compile_features(sleep_cpp PUBLIC cxx_std_11)
 target_include_directories(sleep_cpp PUBLIC
 "$<BUILD_INTERFACE:${CMAKE_CURRENT_BINARY_DIR}/include;${CMAKE_CURRENT_SOURCE_DIR}/src>"
 $<INSTALL_INTERFACE:include>
@@ -38,6 +35,7 @@ add_test(NAME CPPsleep COMMAND main_cpp 150)
 # --- sleep_ms() using time.h C -- more code but also robust/standard
 
 add_library(sleep_c src/sleep.c $<TARGET_OBJECTS:sleep_std>)
+target_compile_definitions(sleep_c PRIVATE $<$<BOOL:${HAVE_NANOSLEEP}>:HAVE_NANOSLEEP>)
 target_include_directories(sleep_c PUBLIC
 "$<BUILD_INTERFACE:${CMAKE_CURRENT_BINARY_DIR}/include;${CMAKE_CURRENT_SOURCE_DIR}/src>"
 $<INSTALL_INTERFACE:include>

diff --git a/cmake/compilers.cmake b/cmake/compilers.cmake
diff --git a/src/sleep.c b/src/sleep.c
@@ -1,3 +1,7 @@
+#if defined(__linux__) && !defined(_DEFAULT_SOURCE)
+#define _DEFAULT_SOURCE
+#endif
+
 #include <stdio.h>
 
 #include "csleep.h"
@@ -15,8 +19,13 @@ void c_sleep(int milliseconds){
 
 #else
 
-#include <stdlib.h>
+#if defined(HAVE_NANOSLEEP)
 #include <time.h>
+#else
+#include <unistd.h>
+#endif
+
+#include <stdlib.h>
 #include <errno.h>
 // https://linux.die.net/man/3/usleep
 void c_sleep(int milliseconds)
@@ -27,31 +36,35 @@ void c_sleep(int milliseconds)
     exit(EINVAL);
   }
 
-  //int ierr = usleep(*milliseconds * 1000);
+  int ierr = 0;
 
+#if defined(HAVE_NANOSLEEP)
   struct timespec t;
 
   t.tv_sec = milliseconds / 1000;
   t.tv_nsec = (milliseconds % 1000) * 1000000;
 
-  int ierr = nanosleep(&t, NULL);
+  ierr = nanosleep(&t, NULL);
+#else
+  ierr = usleep(milliseconds * 1000);
+#endif
 
   if (ierr != 0){
     switch(errno){
       case EINTR:
-        fprintf(stderr, "nanosleep() interrupted\n");
+        fprintf(stderr, "c_sleep() interrupted\n");
         break;
       case EINVAL:
-        fprintf(stderr, "nanosleep() bad milliseconds value\n");
+        fprintf(stderr, "c_sleep() bad milliseconds value\n");
         exit(EINVAL);
       case EFAULT:
-        fprintf(stderr, "nanosleep() bad milliseconds value\n");
+        fprintf(stderr, "c_sleep() bad milliseconds value\n");
         exit(EFAULT);
       case ENOSYS:
-        fprintf(stderr, "nanosleep() not supported on this system\n");
+        fprintf(stderr, "c_sleep() not supported on this system\n");
         exit(ENOSYS);
       default:
-        fprintf(stderr, "nanosleep() error\n");
+        fprintf(stderr, "c_sleep() error\n");
         exit(1);
     }
   }