1Bugs to fix: 2 3- some blocking routines (like sem_wait()) don't work if SA's aren't 4 running yet, because the alarm system isn't up and running or there is no 5 thread context to switch to. It would be weird to use them that 6 way, but it's perfectly legal. 7- There is a race between pthread_cancel() and 8 pthread_cond_broadcast() or pthread_exit() about removing an item 9 from the sleep queue. The locking protocols there need a little 10 adjustment. 11- pthread_sig.c: pthread__kill_self() passes a bogus ucontext to the handler. 12 This is probably not very important. 13- pthread_sig.c: Come up with a signal trampoline naming convention like 14 libc's, so that GDB will have an easier time with things. 15- Consider moving pthread__signal_tramp() to its own file, and building 16 it with -fasync-unwind-tables, so that DWARF2 EH unwinding works through 17 it. (This is required for e.g. GCC's libjava.) 18- Add locking to ld.elf_so so that multiple threads doing lazy binding 19 doesn't trash things. 20- Verify the cancel stub symbol trickery. 21 22 23Interfaces/features to implement: 24- pthread_atfork() 25- priority scheduling 26- libc integration: 27 - foo_r interfaces 28- system integration 29 - some macros and prototypes belong in headers other than pthread.h 30 31 32Features that need more/better regression tests: 33 - pthread_cond_broadcast() 34 - pthread_once() 35 - pthread_get/setspecific() 36 - signals 37 38 39Things that need fixing: 40- Recycle dead threads for new threads. 41 42Ideas to play with: 43- Explore the trapcontext vs. usercontext distinction in ucontext_t. 44- Get rid of thread structures when too many accumulate (is this 45 actually a good idea?) 46- Adaptive spin/sleep locks for mutexes. 47- Currently, each thread uses two real pages of memory: one at the top 48 of the stack for actual stack data, and one at the bottom for the 49 pthread_st. If we can get suitable space above the initial stack for 50 main(), we can cut this to one page per thread. Perhaps crt0 should 51 do something different (give us more space) if libpthread is linked 52 in? 53- Figure out whether/how to expose the inline version of 54 pthread_self(). 55- Along the same lines, figure out whether/how to use registers reserved 56 in the ABI for thread-specific-data to implement pthread_self(). 57- Figure out what to do with changing stack sizes. 58