A followup from the previous mail. I have expanded the program to query pthreads library directly for thread's stack info. Here are the results (the lines containing "Pthr" string have values reported by the pthreads library):
MainThreadId : 3076675264 < main thread, main program > CurrentThreadId : 3076675264 Thread ID : 3078065408 Stack ptr : BFC4B964 Stack top : 00000000 Stack bottom : BF44BA8C Stack length : 8388608 Pthr ThreadId : 3076675264 Pthr Stack ptr : BFC4B928 Pthr Stack top : BFC4D000 Pthr Stack bot : BF44D000 Pthr Stack Len : 8388608 < main thread, library > Libr. CurrentThreadId: 3076675264 Libr. ThreadId : 3078065408 Libr. Stack ptr : BFC4B964 Libr. Stack top : 00000000 Libr. Stack bottom : BF44B694 Libr. Stack length : 8388608 Libr. Pthr ThreadId : 3076675264 Libr. Pthr Stack ptr : BFC4B928 Libr. Pthr Stack top : BFC4D000 Libr. Pthr Stack bot : BF44D000 Libr. Pthr Stack Len : 8388608 < worker thread, main program > CurrentThreadId : 3075664752 Thread ID : 3075664752 Stack ptr : B752E17C Stack top : 00000000 Stack bottom : B712E300 Stack length : 4194304 Pthr ThreadId : 3075664752 Pthr Stack ptr : B752E140 Pthr Stack top : B752F000 Pthr Stack bot : B712E000 Pthr Stack Len : 4198400 < worker thread, library > Libr. CurrentThreadId: 3075664752 Libr. ThreadId : 3078065408 Libr. Stack ptr : B752E17C Libr. Stack top : 00000000 Libr. Stack bottom : BF44B694 Libr. Stack length : 8388608 Libr. Pthr ThreadId : 3075664752 Libr. Pthr Stack ptr : B752E140 Libr. Pthr Stack top : B752F000 Libr. Pthr Stack bot : B712E000 Libr. Pthr Stack Len : 4198400 The values for < worker thread, library > reported by pthreads appear to be correct. First, the stack size is ~ 4MB, which is the worker thread's stack size, although I'm don't know why the discrepancy: 4194304 vs 4198400 bytes. Second, the stack address begins with B7.... (address of the main thread's stack begins with BF.....). Third, the stack pointer is well within the stack limits: B712E000 < B752E140 < B752F000. I have to conclude that the values in rtl/inc/systemh.inc: StackTop, StackBottom, StackLength are not behaving as thread-specific variables in the library, even though they are declared using ThreadVar. The IsMultiThread value in < worker thread, main program > is TRUE, but in < worker thread, library > it is FALSE. Do I have to initialize multithreading in the dynamic library somehow?
checkthreadinfoPThreads.tar.gz
Description: GNU Zip compressed data
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