64 lines
2.6 KiB
Plaintext
64 lines
2.6 KiB
Plaintext
Bugs to fix:
|
|
|
|
- some blocking routines (like sem_wait()) don't work if SA's aren't
|
|
running yet, because the alarm system isn't up and running or there is no
|
|
thread context to switch to. It would be weird to use them that
|
|
way, but it's perfectly legal.
|
|
- There is a race between pthread_cancel() and
|
|
pthread_cond_broadcast() or pthread_exit() about removing an item
|
|
from the sleep queue. The locking protocols there need a little
|
|
adjustment.
|
|
- pthread_sig.c: pthread__signal_tramp() is broken. It gets a ucontext,
|
|
but then hands off an empty (garbage from stack!) sigcontext to the
|
|
handler. The ucontext MUST be converted to a sigcontext, the handler
|
|
called, and then the sigcontext converted back to ucontext, before the
|
|
ucontext is used to perform the sigreturn-analogue. This is necessary
|
|
for e.g. C++/Java exceptions and some garbage-collectors.
|
|
- pthread_sig.c: pthread__signal_tramp() should be changed so that it is
|
|
easy to add support for SA_SIGINFO later. (Mostly a function signature
|
|
issue.)
|
|
- pthread_sig.c: Come up with a signal trampoline naming convention like
|
|
libc's, so that GDB will have an easier time with things.
|
|
- Consider moving pthread__signal_tramp() to its own file, and building
|
|
it with -fasync-unwind-tables, so that DWARF2 EH unwinding works through
|
|
it. (This is required for e.g. GCC's libjava.)
|
|
- Add locking to ld.elf_so so that multiple threads doing lazy binding
|
|
doesn't trash things.
|
|
- Verify the cancel stub symbol trickery.
|
|
|
|
|
|
Interfaces/features to implement:
|
|
- pthread_atfork()
|
|
- priority scheduling
|
|
- libc integration:
|
|
- foo_r interfaces
|
|
- system integration
|
|
- some macros and prototypes belong in headers other than pthread.h
|
|
|
|
|
|
Features that need more/better regression tests:
|
|
- pthread_cond_broadcast()
|
|
- pthread_once()
|
|
- pthread_get/setspecific()
|
|
- signals
|
|
|
|
|
|
Things that need fixing:
|
|
- Recycle dead threads for new threads.
|
|
|
|
Ideas to play with:
|
|
- Explore the trapcontext vs. usercontext distinction in ucontext_t.
|
|
- Get rid of thread structures when too many accumulate (is this
|
|
actually a good idea?)
|
|
- Adaptive spin/sleep locks for mutexes.
|
|
- Currently, each thread uses two real pages of memory: one at the top
|
|
of the stack for actual stack data, and one at the bottom for the
|
|
pthread_st. If we can get suitable space above the initial stack for
|
|
main(), we can cut this to one page per thread. Perhaps crt0 should
|
|
do something different (give us more space) if libpthread is linked
|
|
in?
|
|
- Figure out whether/how to expose the inline version of
|
|
pthread_self().
|
|
- Along the same lines, figure out whether/how to use registers reserved
|
|
in the ABI for thread-specific-data to implement pthread_self().
|