make sure that if semaphore are not usable, we detect it and complain as we should

[simgrid.git] / buildtools / Cmake / CompleteInFiles.cmake

diff --git a/buildtools/Cmake/CompleteInFiles.cmake b/buildtools/Cmake/CompleteInFiles.cmake
index 94271ab..c5883ac 100644 (file)
--- a/buildtools/Cmake/CompleteInFiles.cmake
+++ b/buildtools/Cmake/CompleteInFiles.cmake
@@ -88,6 +88,7 @@ endif(enable_ns3)
 # Checks for header libraries functions.
 CHECK_LIBRARY_EXISTS(pthread   pthread_create                  "" pthread)
 CHECK_LIBRARY_EXISTS(pthread   sem_init                                "" HAVE_SEM_INIT_LIB)
+CHECK_LIBRARY_EXISTS(pthread   sem_open                                "" HAVE_SEM_OPEN_LIB)
 CHECK_LIBRARY_EXISTS(pthread   sem_timedwait                   "" HAVE_SEM_TIMEDWAIT_LIB)
 CHECK_LIBRARY_EXISTS(pthread   pthread_mutex_timedlock "" HAVE_MUTEX_TIMEDLOCK_LIB)
 CHECK_LIBRARY_EXISTS(rt                clock_gettime                   "" HAVE_POSIX_GETTIME)
@@ -205,18 +206,47 @@ elseif(pthread)
 endif(pthread)
 
 if(pthread)
-       ### HAVE_SEM_INIT
+       ### Test that we have a way to create semaphores
        
+       if(HAVE_SEM_OPEN_LIB)
+               exec_program("${CMAKE_C_COMPILER} -lpthread ${CMAKE_HOME_DIRECTORY}/buildtools/Cmake/test_prog/prog_sem_open.c -o testprog"
+                            OUTPUT_VARIABLE HAVE_SEM_OPEN_run)
+               if(HAVE_SEM_OPEN_run)
+                       set(HAVE_SEM_OPEN 0)
+               else(HAVE_SEM_OPEN_run)
+                       exec_program("./testprog" RETURN_VALUE HAVE_SEM_OPEN_run2)
+                       if(HAVE_SEM_OPEN_run2)
+                               set(HAVE_SEM_OPEN 0)
+                       else(HAVE_SEM_OPEN_run2)
+                               set(HAVE_SEM_OPEN 1)
+                       endif(HAVE_SEM_OPEN_run2)       
+               endif(HAVE_SEM_OPEN_run)
+        else(HAVE_SEM_OPEN_LIB)
+               set(HAVE_SEM_OPEN 0)
+       endif(HAVE_SEM_OPEN_LIB)
+
        if(HAVE_SEM_INIT_LIB)
-               exec_program("${CMAKE_C_COMPILER} -lpthread ${CMAKE_HOME_DIRECTORY}/buildtools/Cmake/test_prog/prog_sem_init.c" OUTPUT_VARIABLE HAVE_SEM_INIT_run)
+               exec_program("${CMAKE_C_COMPILER} -lpthread ${CMAKE_HOME_DIRECTORY}/buildtools/Cmake/test_prog/prog_sem_init.c -o testprog" 
+                            OUTPUT_VARIABLE HAVE_SEM_INIT_run)
                if(HAVE_SEM_INIT_run)
                        set(HAVE_SEM_INIT 0)
                else(HAVE_SEM_INIT_run)
-                       set(HAVE_SEM_INIT 1)
+                       exec_program("./testprog" RETURN_VALUE HAVE_SEM_INIT_run)
+                       if(HAVE_SEM_INIT_run)
+                               set(HAVE_SEM_INIT 0)
+                       else(HAVE_SEM_INIT_run)
+                               set(HAVE_SEM_INIT 1)
+                       endif(HAVE_SEM_INIT_run)
                endif(HAVE_SEM_INIT_run)
+        else(HAVE_SEM_INIT_LIB)
+               set(HAVE_SEM_INIT 0)
        endif(HAVE_SEM_INIT_LIB)
 
-       ### HAVE_SEM_TIMEDWAIT
+       if(NOT HAVE_SEM_OPEN AND NOT HAVE_SEM_INIT)
+               message(FATAL_ERROR "Semaphores are not usable, but they are mandatory to threads (you may need to mount /dev).")
+       endif(NOT HAVE_SEM_OPEN AND NOT HAVE_SEM_INIT)
+
+       ### Test that we have a way to timewait for semaphores
 
        if(HAVE_SEM_TIMEDWAIT_LIB)
                exec_program("${CMAKE_C_COMPILER} -lpthread ${CMAKE_HOME_DIRECTORY}/buildtools/Cmake/test_prog/prog_sem_timedwait.c" OUTPUT_VARIABLE HAVE_SEM_TIMEDWAIT_run)