| Commit message (Expand) | Author | Age | Files | Lines |
|---|
| * | optimize spinlock spin | Rich Felker | 2011-03-24 | 1 | -1/+1 |
| * | fix non-atomicity of puts | Rich Felker | 2011-03-24 | 1 | -1/+5 |
| * | overhaul cancellation to fix resource leaks and dangerous behavior with signals•••this commit addresses two issues:
1. a race condition, whereby a cancellation request occurring after a
syscall returned from kernelspace but before the subsequent
CANCELPT_END would cause cancellable resource-allocating syscalls
(like open) to leak resources.
2. signal handlers invoked while the thread was blocked at a
cancellation point behaved as if asynchronous cancellation mode wer in
effect, resulting in potentially dangerous state corruption if a
cancellation request occurs.
the glibc/nptl implementation of threads shares both of these issues.
with this commit, both are fixed. however, cancellation points
encountered in a signal handler will not be acted upon if the signal
was received while the thread was already at a cancellation point.
they will of course be acted upon after the signal handler returns, so
in real-world usage where signal handlers quickly return, it should
not be a problem. it's possible to solve this problem too by having
sigaction() wrap all signal handlers with a function that uses a
pthread_cleanup handler to catch cancellation, patch up the saved
context, and return into the cancellable function that will catch and
act upon the cancellation. however that would be a lot of complexity
for minimal if any benefit...
| Rich Felker | 2011-03-24 | 12 | -13/+43 |
| * | very cheap double-free checks in malloc | Rich Felker | 2011-03-23 | 1 | -0/+4 |
| * | global cleanup to use the new syscall interface | Rich Felker | 2011-03-20 | 160 | -238/+180 |
| * | if returning errno value directly from a syscall, we need to negate it. | Rich Felker | 2011-03-19 | 3 | -3/+3 |
| * | syscall overhaul part two - unify public and internal syscall interface•••with this patch, the syscallN() functions are no longer needed; a
variadic syscall() macro allows syscalls with anywhere from 0 to 6
arguments to be made with a single macro name. also, manually casting
each non-integer argument with (long) is no longer necessary; the
casts are hidden in the macros.
some source files which depended on being able to define the old macro
SYSCALL_RETURNS_ERRNO have been modified to directly use __syscall()
instead of syscall(). references to SYSCALL_SIGSET_SIZE and SYSCALL_LL
have also been changed.
x86_64 has not been tested, and may need a follow-up commit to fix any
minor bugs/oversights.
| Rich Felker | 2011-03-19 | 19 | -31/+53 |
| * | remove comment cruft that got left behind in x86_64 syscall.s | Rich Felker | 2011-03-19 | 1 | -1/+0 |
| * | overhaul syscall interface•••this commit shuffles around the location of syscall definitions so
that we can make a syscall() library function with both SYS_* and
__NR_* style syscall names available to user applications, provides
the syscall() library function, and optimizes the code that performs
the actual inline syscalls in the library itself.
previously on i386 when built as PIC (shared library), syscalls were
incurring bus lock (lock prefix) overhead at entry and exit, due to
the way the ebx register was being loaded (xchg instruction with a
memory operand). now the xchg takes place between two registers.
further cleanup to arch/$(ARCH)/syscall.h is planned.
| Rich Felker | 2011-03-19 | 6 | -13/+67 |
| * | various legacy and linux-specific stuff•••this commit is part of an effort to make more of busybox work
out-of-the-box.
| Rich Felker | 2011-03-18 | 1 | -0/+5 |
| * | implement [v]swprintf | Rich Felker | 2011-03-18 | 3 | -1/+61 |
| * | implement wprintf family of functions•••this implementation is extremely ugly and inefficient, but it avoids a
good deal of code duplication and bloat. it may be cleaned up later to
eliminate the remaining code duplication and some of the warts, but i
don't really care about its performance.
note that swprintf is not yet implemented.
| Rich Felker | 2011-03-17 | 4 | -0/+387 |
| * | fix broken wmemchr (unbounded search) | Rich Felker | 2011-03-17 | 1 | -1/+1 |
| * | implement robust mutexes•••some of this code should be cleaned up, e.g. using macros for some of
the bit flags, masks, etc. nonetheless, the code is believed to be
working and correct at this point.
| Rich Felker | 2011-03-17 | 9 | -10/+83 |
| * | avoid function call to pthread_self in mutex unlock•••if the mutex was previously locked, we can assume pthread_self was
already called at the time of locking, and thus that the thread
pointer is initialized.
| Rich Felker | 2011-03-17 | 1 | -1/+1 |
| * | reorder mutex struct fields to make room for pointers (upcoming robust mutexes)•••the layout has been chosen so that pointer slots 3 and 4 fit between
the integer slots on 32-bit archs, and come after the integer slots on
64-bit archs.
| Rich Felker | 2011-03-17 | 1 | -1/+3 |
| * | unify lock and owner fields of mutex structure•••this change is necessary to free up one slot in the mutex structure so
that we can use doubly-linked lists in the implementation of robust
mutexes.
| Rich Felker | 2011-03-17 | 4 | -8/+6 |
| * | optimize contended normal mutex case; add int compare-and-swap atomic | Rich Felker | 2011-03-17 | 1 | -1/+1 |
| * | simplify logic, slightly optimize contended case for non-default mutex types | Rich Felker | 2011-03-16 | 1 | -4/+2 |
| * | correct error returns for error-checking mutexes | Rich Felker | 2011-03-16 | 2 | -2/+6 |
| * | cut out a syscall on thread creation in the case where guard size is 0 | Rich Felker | 2011-03-16 | 1 | -1/+1 |
| * | don't expose EAGAIN, etc. from timed futex wait to caller | Rich Felker | 2011-03-16 | 1 | -1/+4 |
| * | optimize file locking: avoid cache-polluting writes to global storage | Rich Felker | 2011-03-16 | 2 | -3/+5 |
| * | partially-written draft of fmemopen, still in #if 0 | Rich Felker | 2011-03-14 | 1 | -3/+48 |
| * | misplaced & in times() made it fail to work, and clobber the stack | Rich Felker | 2011-03-12 | 1 | -1/+1 |
| * | implement flockfile api, rework stdio locking | Rich Felker | 2011-03-12 | 9 | -15/+66 |
| * | implement dummy pthread_attr_[gs]etschedparam functions•••for some reason these functions are not shaded by the PS/TPS option in
POSIX, so presumably they are mandatory, even though the functionality
they offer is optional. for now, provide them in case any programs
depend on their existence, but disallow any priority except the
default.
| Rich Felker | 2011-03-11 | 2 | -0/+14 |
| * | fix pthread_attr_* implementations to match corrected prototypes | Rich Felker | 2011-03-11 | 4 | -4/+4 |
| * | fix failure behavior of sem_open when sem does not exist | Rich Felker | 2011-03-10 | 1 | -1/+5 |
| * | fix some semaphore wait semantics (race condition deadlock and error checking) | Rich Felker | 2011-03-10 | 2 | -1/+7 |
| * | fix sem_open and sem_close to obey posix semantics•••multiple opens of the same named semaphore must return the same
pointer, and only the last close can unmap it. thus the ugly global
state keeping track of mappings. the maximum number of distinct named
semaphores that can be opened is limited sufficiently small that the
linear searches take trivial time, especially compared to the syscall
overhead of these functions.
| Rich Felker | 2011-03-10 | 3 | -38/+85 |
| * | optimize pthread termination in the non-detached case•••we can avoid blocking signals by simply using a flag to mark that the
thread has exited and prevent it from getting counted in the rsyscall
signal-pingpong. this restores the original pthread create/join
throughput from before the sigprocmask call was added.
| Rich Felker | 2011-03-10 | 2 | -4/+16 |
| * | fix errors in sigqueue (potential information leak, wrong behavior)•••1. any padding in the siginfo struct was not necessarily zero-filled,
so it might have contained private data off the caller's stack.
2. the uid and pid must be filled in from userspace. the previous
rsyscall fix broke rsyscalls because the values were always incorrect.
| Rich Felker | 2011-03-10 | 1 | -5/+7 |
| * | security fix: check that cancel/rsyscall signal was sent by the process itself | Rich Felker | 2011-03-10 | 1 | -0/+3 |
| * | more cancellation points: tcdrain, clock_nanosleep | Rich Felker | 2011-03-10 | 2 | -2/+12 |
| * | remove useless return value checks for functions that cannot fail | Rich Felker | 2011-03-10 | 1 | -3/+2 |
| * | make sigsuspend a cancellation point | Rich Felker | 2011-03-10 | 1 | -1/+6 |
| * | make sigtimedwait a cancellation point | Rich Felker | 2011-03-10 | 1 | -0/+3 |
| * | don't fail with EINTR in sigtimedwait•••POSIX allows either behavior, but sigwait is not allowed to fail with
EINTR, so the retry loop would have to be in one or the other anyway.
| Rich Felker | 2011-03-10 | 1 | -6/+6 |
| * | fix sigsuspend syscall | Rich Felker | 2011-03-10 | 1 | -1/+1 |
| * | make sigaltstack work (missing macros in signal.h, error conditions) | Rich Felker | 2011-03-10 | 1 | -1/+11 |
| * | fix errno behavior in clock_* functions•••these functions are specified inconsistent in whether they're
specified to return an error value, or return -1 and set errno.
hopefully now they all match what POSIX requires.
| Rich Felker | 2011-03-10 | 3 | -3/+0 |
| * | fix error handling for pthread_sigmask•••it must return errno, not -1, and should reject invalud values for how.
| Rich Felker | 2011-03-09 | 2 | -1/+15 |
| * | make fork properly initialize the main thread in the child process | Rich Felker | 2011-03-09 | 1 | -0/+7 |
| * | optimize pthread initialization•••the set_tid_address returns the tid (which is also the pid when called
from the initial thread) so there is no need to make a separate
syscall to get pid/tid.
| Rich Felker | 2011-03-09 | 1 | -2/+2 |
| * | fix race condition in raise - just mask signals•••a signal handler could fork after the pid/tid were read, causing the
wrong process to be signalled. i'm not sure if this is supposed to
have UB or not, but raise is async-signal-safe, so it probably is
allowed. the current solution is slightly expensive so this
implementation is likely to be changed in the future.
| Rich Felker | 2011-03-09 | 1 | -9/+9 |
| * | fix raise semantics with threads. | Rich Felker | 2011-03-09 | 1 | -1/+12 |
| * | simplify and optimize pthread_mutex_trylock | Rich Felker | 2011-03-08 | 1 | -17/+16 |
| * | rwlock trylock functions were wrongly returning EAGAIN instead of EBUSY | Rich Felker | 2011-03-08 | 2 | -3/+3 |
| * | fix major breakage in pthread_once (it was always deadlocking)•••the issue was a break statement that was breaking only from the
switch, not the enclosing for loop, and a failure to set the final
success state.
| Rich Felker | 2011-03-08 | 1 | -8/+7 |
