# - This module determines the thread library of the system. # The following variables are set # CMAKE_THREAD_LIBS_INIT - the thread library # CMAKE_USE_SPROC_INIT - are we using sproc? # CMAKE_USE_WIN32_THREADS_INIT - using WIN32 threads? # CMAKE_USE_PTHREADS_INIT - are we using pthreads # CMAKE_HP_PTHREADS_INIT - are we using hp pthreads # For systems with multiple thread libraries, caller can set # CMAKE_THREAD_PREFER_PTHREAD #============================================================================= # Copyright 2002-2009 Kitware, Inc. # # Distributed under the OSI-approved BSD License (the "License"); # see accompanying file Copyright.txt for details. # # This software is distributed WITHOUT ANY WARRANTY; without even the # implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. # See the License for more information. #============================================================================= # (To distribute this file outside of CMake, substitute the full # License text for the above reference.) include (CheckIncludeFiles) include (CheckLibraryExists) include (CheckSymbolExists) set(Threads_FOUND FALSE) # Do we have sproc? if(CMAKE_SYSTEM MATCHES IRIX AND NOT CMAKE_THREAD_PREFER_PTHREAD) CHECK_INCLUDE_FILES("sys/types.h;sys/prctl.h" CMAKE_HAVE_SPROC_H) endif() if(CMAKE_HAVE_SPROC_H AND NOT CMAKE_THREAD_PREFER_PTHREAD) # We have sproc set(CMAKE_USE_SPROC_INIT 1) else() # Do we have pthreads? CHECK_INCLUDE_FILES("pthread.h" CMAKE_HAVE_PTHREAD_H) if(CMAKE_HAVE_PTHREAD_H) # # We have pthread.h # Let's check for the library now. # set(CMAKE_HAVE_THREADS_LIBRARY) if(NOT THREADS_HAVE_PTHREAD_ARG) # Check if pthread functions are in normal C library CHECK_SYMBOL_EXISTS(pthread_create pthread.h CMAKE_HAVE_LIBC_CREATE) if(CMAKE_HAVE_LIBC_CREATE) set(CMAKE_THREAD_LIBS_INIT "") set(CMAKE_HAVE_THREADS_LIBRARY 1) set(Threads_FOUND TRUE) endif() if(NOT CMAKE_HAVE_THREADS_LIBRARY) # Do we have -lpthreads CHECK_LIBRARY_EXISTS(pthreads pthread_create "" CMAKE_HAVE_PTHREADS_CREATE) if(CMAKE_HAVE_PTHREADS_CREATE) set(CMAKE_THREAD_LIBS_INIT "-lpthreads") set(CMAKE_HAVE_THREADS_LIBRARY 1) set(Threads_FOUND TRUE) endif() # Ok, how about -lpthread CHECK_LIBRARY_EXISTS(pthread pthread_create "" CMAKE_HAVE_PTHREAD_CREATE) if(CMAKE_HAVE_PTHREAD_CREATE) set(CMAKE_THREAD_LIBS_INIT "-lpthread") set(CMAKE_HAVE_THREADS_LIBRARY 1) set(Threads_FOUND TRUE) endif() if(CMAKE_SYSTEM MATCHES "SunOS.*") # On sun also check for -lthread CHECK_LIBRARY_EXISTS(thread thr_create "" CMAKE_HAVE_THR_CREATE) if(CMAKE_HAVE_THR_CREATE) set(CMAKE_THREAD_LIBS_INIT "-lthread") set(CMAKE_HAVE_THREADS_LIBRARY 1) set(Threads_FOUND TRUE) endif() endif() endif() endif() if(NOT CMAKE_HAVE_THREADS_LIBRARY) # If we did not found -lpthread, -lpthread, or -lthread, look for -pthread if("THREADS_HAVE_PTHREAD_ARG" MATCHES "^THREADS_HAVE_PTHREAD_ARG") message(STATUS "Check if compiler accepts -pthread") try_run(THREADS_PTHREAD_ARG THREADS_HAVE_PTHREAD_ARG ${CMAKE_BINARY_DIR} ${CMAKE_ROOT}/Modules/CheckForPthreads.c CMAKE_FLAGS -DLINK_LIBRARIES:STRING=-pthread COMPILE_OUTPUT_VARIABLE OUTPUT) if(THREADS_HAVE_PTHREAD_ARG) if(THREADS_PTHREAD_ARG STREQUAL "2") set(Threads_FOUND TRUE) message(STATUS "Check if compiler accepts -pthread - yes") else() message(STATUS "Check if compiler accepts -pthread - no") file(APPEND ${CMAKE_BINARY_DIR}${CMAKE_FILES_DIRECTORY}/CMakeError.log "Determining if compiler accepts -pthread returned ${THREADS_PTHREAD_ARG} instead of 2. The compiler had the following output:\n${OUTPUT}\n\n") endif() else() message(STATUS "Check if compiler accepts -pthread - no") file(APPEND ${CMAKE_BINARY_DIR}${CMAKE_FILES_DIRECTORY}/CMakeError.log "Determining if compiler accepts -pthread failed with the following output:\n${OUTPUT}\n\n") endif() endif() if(THREADS_HAVE_PTHREAD_ARG) set(Threads_FOUND TRUE) set(CMAKE_THREAD_LIBS_INIT "-pthread") endif() endif() endif() endif() if(CMAKE_THREAD_LIBS_INIT OR CMAKE_HAVE_LIBC_CREATE) set(CMAKE_USE_PTHREADS_INIT 1) set(Threads_FOUND TRUE) endif() if(CMAKE_SYSTEM MATCHES "Windows") set(CMAKE_USE_WIN32_THREADS_INIT 1) set(Threads_FOUND TRUE) endif() if(CMAKE_USE_PTHREADS_INIT) if(CMAKE_SYSTEM MATCHES "HP-UX-*") # Use libcma if it exists and can be used. It provides more # symbols than the plain pthread library. CMA threads # have actually been deprecated: # http://docs.hp.com/en/B3920-90091/ch12s03.html#d0e11395 # http://docs.hp.com/en/947/d8.html # but we need to maintain compatibility here. # The CMAKE_HP_PTHREADS setting actually indicates whether CMA threads # are available. CHECK_LIBRARY_EXISTS(cma pthread_attr_create "" CMAKE_HAVE_HP_CMA) if(CMAKE_HAVE_HP_CMA) set(CMAKE_THREAD_LIBS_INIT "-lcma") set(CMAKE_HP_PTHREADS_INIT 1) set(Threads_FOUND TRUE) endif() set(CMAKE_USE_PTHREADS_INIT 1) endif() if(CMAKE_SYSTEM MATCHES "OSF1-V*") set(CMAKE_USE_PTHREADS_INIT 0) set(CMAKE_THREAD_LIBS_INIT ) endif() if(CMAKE_SYSTEM MATCHES "CYGWIN_NT*") set(CMAKE_USE_PTHREADS_INIT 1) set(Threads_FOUND TRUE) set(CMAKE_THREAD_LIBS_INIT ) set(CMAKE_USE_WIN32_THREADS_INIT 0) endif() endif() include(${CMAKE_CURRENT_LIST_DIR}/FindPackageHandleStandardArgs.cmake) FIND_PACKAGE_HANDLE_STANDARD_ARGS(Threads DEFAULT_MSG Threads_FOUND)