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Diffstat (limited to 'Modules/FindThreads.cmake')
| -rw-r--r-- | Modules/FindThreads.cmake | 166 |
1 files changed, 166 insertions, 0 deletions
diff --git a/Modules/FindThreads.cmake b/Modules/FindThreads.cmake new file mode 100644 index 000000000..21614fb66 --- /dev/null +++ b/Modules/FindThreads.cmake @@ -0,0 +1,166 @@ +# - 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(CMAKE_SYSTEM MATCHES "SunOS.*") + ENDIF(NOT CMAKE_HAVE_THREADS_LIBRARY) + ENDIF(NOT THREADS_HAVE_PTHREAD_ARG) + + 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} + ${CMAKE_ROOT}/Modules/CheckForPthreads.c + CMAKE_FLAGS -DLINK_LIBRARIES:STRING=-pthread + COMPILE_OUTPUT_VARIABLE OUTPUT) + + IF(THREADS_HAVE_PTHREAD_ARG) + IF(THREADS_PTHREAD_ARG MATCHES "^2$") + 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${OUTPUT}\n\n") + ENDIF() + + ENDIF("THREADS_HAVE_PTHREAD_ARG" MATCHES "^THREADS_HAVE_PTHREAD_ARG") + + IF(THREADS_HAVE_PTHREAD_ARG) + SET(Threads_FOUND TRUE) + SET(CMAKE_THREAD_LIBS_INIT "-pthread") + ENDIF() + + ENDIF(NOT CMAKE_HAVE_THREADS_LIBRARY) + ENDIF(CMAKE_HAVE_PTHREAD_H) +ENDIF() + +IF(CMAKE_THREAD_LIBS_INIT OR CMAKE_HAVE_LIBC_CREATE) + SET(CMAKE_USE_PTHREADS_INIT 1) + SET(Threads_FOUND TRUE) +ENDIF() + +IF(CMAKE_SYSTEM MATCHES "Windows") + SET(CMAKE_USE_WIN32_THREADS_INIT 1) + SET(Threads_FOUND TRUE) +ENDIF() + +IF(CMAKE_USE_PTHREADS_INIT) + IF(CMAKE_SYSTEM MATCHES "HP-UX-*") + # Use libcma if it exists and can be used. It provides more + # symbols than the plain pthread library. CMA threads + # have actually been deprecated: + # http://docs.hp.com/en/B3920-90091/ch12s03.html#d0e11395 + # http://docs.hp.com/en/947/d8.html + # but we need to maintain compatibility here. + # The CMAKE_HP_PTHREADS setting actually indicates whether CMA threads + # are available. + CHECK_LIBRARY_EXISTS(cma pthread_attr_create "" CMAKE_HAVE_HP_CMA) + IF(CMAKE_HAVE_HP_CMA) + SET(CMAKE_THREAD_LIBS_INIT "-lcma") + SET(CMAKE_HP_PTHREADS_INIT 1) + SET(Threads_FOUND TRUE) + ENDIF(CMAKE_HAVE_HP_CMA) + SET(CMAKE_USE_PTHREADS_INIT 1) + ENDIF() + + IF(CMAKE_SYSTEM MATCHES "OSF1-V*") + SET(CMAKE_USE_PTHREADS_INIT 0) + SET(CMAKE_THREAD_LIBS_INIT ) + ENDIF() + + IF(CMAKE_SYSTEM MATCHES "CYGWIN_NT*") + SET(CMAKE_USE_PTHREADS_INIT 1) + SET(Threads_FOUND TRUE) + SET(CMAKE_THREAD_LIBS_INIT ) + SET(CMAKE_USE_WIN32_THREADS_INIT 0) + ENDIF() +ENDIF(CMAKE_USE_PTHREADS_INIT) + +INCLUDE(${CMAKE_CURRENT_LIST_DIR}/FindPackageHandleStandardArgs.cmake) +FIND_PACKAGE_HANDLE_STANDARD_ARGS(Threads DEFAULT_MSG Threads_FOUND) |