semaphores_timed.cpp
Go to the documentation of this file.
00001 
00009 /*****************************************************************************
00010 ** Includes
00011 *****************************************************************************/
00012 
00013 #include <iostream>
00014 #include <cstdlib>
00015 #include <gtest/gtest.h>
00016 #include <ecl/time/sleep.hpp>
00017 #include <ecl/time/timestamp.hpp>
00018 #include "../../include/ecl/ipc/semaphore.hpp"
00019 #include "../../include/ecl/ipc/shared_memory.hpp"
00020 
00021 #ifdef ECL_HAS_SEMAPHORES
00022 
00023 /*****************************************************************************
00024 ** Using
00025 *****************************************************************************/
00026 
00027 using std::string;
00028 using ecl::SharedMemory;
00029 using ecl::Semaphore;
00030 using ecl::Duration;
00031 using ecl::Sleep;
00032 
00033 /*****************************************************************************
00034 ** Doxygen
00035 *****************************************************************************/
00036 
00041 /*****************************************************************************
00042 ** Namespaces
00043 *****************************************************************************/
00044 
00045 namespace ecl {
00046 namespace ipc {
00047 namespace tests {
00048 
00049 /*****************************************************************************
00050 ** Data Storage Class
00051 *****************************************************************************/
00052 
00053 class SemaphoreTimedData {
00054     public:
00055         double value[2];
00056         void initialise() { value[0] = 1.0; value[1] = 2.0; };
00057 };
00058 
00059 } // namespace tests
00060 } // namespace ipc
00061 } // namespace ecl
00062 
00063 /*****************************************************************************
00064 ** Using
00065 *****************************************************************************/
00066 
00067 using ecl::ipc::tests::SemaphoreTimedData;
00068 
00069 /*****************************************************************************
00070 ** Doxygen
00071 *****************************************************************************/
00072 
00077 /*****************************************************************************
00078 ** Tests
00079 *****************************************************************************/
00080 
00081 TEST(SemaphoreTimedTests,access) {
00082 
00083     string sm_name("shared_memory");
00084     string sem_name("shared_semaphore");
00085     Sleep sleep;
00086     Duration timeout(0,750000000);
00087 
00088     pid_t pID = fork();
00089     if (pID == 0)
00090     {
00091         /*********************************************************************
00092         ** Child
00093         *********************************************************************/
00094 //        std::cout << "Child waiting" << std::endl;
00095         sleep(1);
00096         try {
00097             SharedMemory<SemaphoreTimedData> sm(sm_name);
00098             Semaphore semaphore(sem_name);
00099 //        std::cout << "Child trying the lock for 750ms" << std::endl;
00100             bool result = semaphore.trylock(timeout);
00101             EXPECT_FALSE(result);
00102             if ( result ) {
00103 //              std::cout << "Child locked semaphore." << std::endl;
00104             } else {
00105 //              std::cout << "Child lock attempt timed out." << std::endl;
00106 //            std::cout << "Child trying the lock again for 750ms" << std::endl;
00107                 if ( (result = semaphore.trylock(timeout)) ) {
00108                    EXPECT_TRUE(result);
00109 //                 std::cout << "Child locked semaphore." << std::endl;
00110                 } else {
00111 //              std::cout << "Child lock attempt timed out." << std::endl;
00112                 }
00113             }
00114             semaphore.unlock();
00115         } catch ( ecl::StandardException &e ) {
00116             // Don't fail the test, hudson doesn't let us have permissions for instance.
00117             std::cout << e.what() << std::endl;
00118         }
00119     }
00120     else if (pID < 0)            // failed to fork
00121     {
00122         std::cerr << "Failed to fork" << std::endl;
00123         exit(1);
00124     }
00125     else
00126     {
00127         /*********************************************************************
00128         ** Parent
00129         *********************************************************************/
00130         try {
00131             SharedMemory<SemaphoreTimedData> sm(sm_name);
00132             Semaphore semaphore(sem_name);
00133             SemaphoreTimedData *data = sm.data();
00134             semaphore.lock();
00135             data->value[0] = 1.3;
00136             data->value[1] = 2.3;
00137             EXPECT_EQ(1.3,data->value[0]);
00138             EXPECT_EQ(2.3,data->value[1]);
00139 //        std::cout << "Parent in the shared memory" << std::endl;
00140 //        std::cout << "Parent locking the semaphore." << std::endl;
00141             sleep(2);
00142 //        std::cout << "Parent unlocking the semaphore." << std::endl;
00143             semaphore.unlock();
00144             sleep(2);
00145         } catch ( ecl::StandardException &e ) {
00146             // Don't fail the test, hudson doesn't let us have permissions for instance.
00147             std::cout << e.what() << std::endl;
00148         }
00149     }
00150 }
00151 
00152 /*****************************************************************************
00153 ** Main program
00154 *****************************************************************************/
00155 
00156 int main(int argc, char **argv) {
00157 
00158     std::cout << std::endl;
00159     std::cout << "What you should see:" << std::endl;
00160     std::cout << "  - Process forks" << std::endl;
00161     std::cout << "  - Parent creates shared memory." << std::endl;
00162     std::cout << "  - Parent locks a semaphore and enters shared memory for 2 seconds." << std::endl;
00163     std::cout << "  - Child waits one second and tries lock for 750ms." << std::endl;
00164     std::cout << "  - Child fails and again tries lock for 750ms." << std::endl;
00165     std::cout << "  - Child succeeds in locking.." << std::endl;
00166     std::cout << std::endl;
00167 
00168     testing::InitGoogleTest(&argc,argv);
00169     return RUN_ALL_TESTS();
00170 }
00171 
00172 #else
00173 
00174 /*****************************************************************************
00175 ** Alternative Main
00176 *****************************************************************************/
00177 
00178 int main(int argc, char **argv) {
00179     std::cout << std::endl;
00180     std::cout << "Semaphores are not supported on this platform (or ecl is just lacking)." << std::endl;
00181     std::cout << std::endl;
00182     return 0;
00183 }
00184 
00185 #endif /* ECL_HAS_SEMAPHORES */
00186 
00187 
00188 
00189 
00190 
00191 
00192 


ecl_ipc
Author(s): Daniel Stonier
autogenerated on Wed Aug 26 2015 11:27:28