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Posted to commits@harmony.apache.org by "Ilya Leviev (JIRA)" <ji...@apache.org> on 2007/05/18 17:40:16 UTC
[jira] Updated: (HARMONY-3914) [drlvm][thread] Race conditions at
"thread_native_basic.c":(480,275)
[ https://issues.apache.org/jira/browse/HARMONY-3914?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Ilya Leviev updated HARMONY-3914:
---------------------------------
Attachment: SourceViewScreenshot-1.jpg
Source View screenshot added
> [drlvm][thread] Race conditions at "thread_native_basic.c":(480,275)
> --------------------------------------------------------------------
>
> Key: HARMONY-3914
> URL: https://issues.apache.org/jira/browse/HARMONY-3914
> Project: Harmony
> Issue Type: Bug
> Components: DRLVM
> Environment: win2003
> Reporter: Ilya Leviev
> Attachments: SourceViewScreenshot-1.jpg
>
>
> TC report on thread unsafe access that result in race condition that occur during concurrent execution of hythread_get_thread and hythread_detach functions.
> Read -> Write data-race
> Memory write at "thread_native_basic.c":275 conflicts with a prior memory read at "thread_native_basic.c":480
> Stack Trace:
> Context
> Function jthread_create "thread_java_basic.c":63
> Function jthread_create_with_function "thread_java_basic.c":179
> Function hythread_create "thread_native_basic.c":165
> Function hythread_create_with_group "thread_native_basic.c":136
> Function os_thread_create "os_thread.c":37
> Function _beginthreadex "threadex.c":145
> Function EntryPoint "dllcrt0.c":323
> Function threadstartex "threadex.c":241
> Function thread_start_proc "thread_native_basic.c":720
> Function hythread_detach "thread_native_basic.c":259
> 1st Access
> Function vm_invoke_native_array_stub "ini_ia32.cpp":76
> Function class VM_thread * get_thread_ptr_stub(void) "thread_manager.cpp":138
> Function m2n_free_local_handles "m2n_ia32.cpp":268
> Function class VM_thread * get_thread_ptr_stub(void) "thread_manager.cpp":138
> Function m2n_free_local_handles "m2n_ia32.cpp":268
> Function hythread_thin_monitor_try_enter "thread_native_thin_monitor.c":341
> Function class VM_thread * get_thread_ptr_stub(void) "thread_manager.cpp":138
> Function jthread_monitor_enter "thread_java_monitors.c":88
> Function unreserve_lock "thread_native_thin_monitor.c":151
> Function hythread_get_thread "thread_native_basic.c":480
> "479" "" " hythread_t VMCALL hythread_get_thread(IDATA id) {"
> "480" "*" " return fast_thread_array[id];"
> "481" "" " }"
> 2nd Access
> Function jthread_create "thread_java_basic.c":63
> Function jthread_create_with_function "thread_java_basic.c":179
> Function hythread_create "thread_native_basic.c":165
> Function hythread_create_with_group "thread_native_basic.c":136
> Function os_thread_create "os_thread.c":37
> Function _beginthreadex "threadex.c":145
> Function EntryPoint "dllcrt0.c":323
> Function threadstartex "threadex.c":241
> Function thread_start_proc "thread_native_basic.c":720
> Function hythread_detach "thread_native_basic.c":275
> "274" "" " thread_set_self(NULL);"
> "275" "*" " fast_thread_array[thread->thread_id] = NULL;"
> "276" "" " "
> See also Source View screenshot.
> Notes on Read->write race condition.
> ------------------------------------
> Read->write data races occur when one thread reads a shared memory location (address) while another thread concurrently writes the same memory location.
> The shared memory location may be referred to by (variable) name, pointer, or even a function such as memcpy().
> The following example uses a variable name:
> 1st access by first thread
> S1: privateA = sharedX
> 2nd access by second thread
> S2: sharedX = privateB
> If sharedX is a variable visible to all threads and privateA and privateB are local variables visible only to the thread where each was declared,
> concurrent execution of the above statements by multiple threads results in a "race" on the value to be read from sharedX.
> Since the order of execution among threads is unpredictable, it is unknown what value will be read from sharedX and written into privateA.
> This results in non-deterministic software, or software prone to produce different results each time it is executed.
> ______________________________________________________________________________________________________________________
> If it not affect correctness of execution I will mark it by special API for prevention of further alarms on this race.
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