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# - 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)
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