| Commit message (Collapse) | Author | Age | Files | Lines |
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as the child only has the one thread remaining.
ok marc@
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the use of spinlocks and malloc. All needed memory is allocated upfront
and _thread_kern_sig_defer/undefer() is now used to protect critical
sections. okay guenther@
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is needed to avoid deadlocks in popen() on FILE locking.
ok kurt@
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calls vfork(2). "untested, but looks OK" marc@
- document vfork(2), popen(3) and system(3) don't call atfork handlers
in multithreaded programs. okay jmc@
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vfork() has only one semantic: "parent stalls until child does execve
or exit" and no other semantic. it is unfair to act as if pthread
vfork() suddenly lacks that semantic.
ok kurt millert kettenis beck
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applications that increase nofiles using setrlimit(2). ok marc@
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from the parent to all non-blocking. This prevents the child from restoring
the file to be blocking upon close() and causing the parent to deadlock
when it later attempts to utilize the blocking fd. Corrects the netbeans
build failure caused by the jdk forkAndExec() function that replaces the
std fd's before execvp(). okay marc@
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Adjust design of file descriptor table to eliminate races
with both opening and closing of file descriptor entries
and eliminates one class of deadlocks. One nice side effect
of this change in design should be better performance for
applications that open and close many file descriptors due
to reduced fd_table_lock contention and fd entry reuse.
- Add entry states to manage use of entry and eliminate
some closing races. fd entries are not deallocated upon
close() now.
- Call _thread_fd_table_init with one of five discreet
modes to properly initialize an entry and manage the
state transition to open.
- When closing an entry hold the entry spinlock locked
across the state transition and the _thread_sys_close
call to close another race.
- Introduce a new lock type FD_RDWR_CLOSE that transitions
either a closed entry or an open entry into closing state
and then waits for a RDWR lock so that the lock queue can
unwind normally. All subsequent fd lock attempts for that
entry are rejected with EBADF until the fd is fully closed,
or reopened by dup2(). Once a thread holds the FD_RDWR_LOCK
it is safe to close() it or dup2() on it.
- When a thread creates a new fd there is a window of time
when another thread could attempt to use the fd before the
creating thread has initialized the entry for it. This can
result in improper status_flags for the entry, so record
the entries init mode, detect when this has happened and
correct the status_flags when needed.
reviewed by marc@ & brad@, tested by several, okay brad@
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File status flags should be shared for dup'ed file descriptors.
However fd_table_entry's should not be shared for dup'ed file
descriptors so they can be independently be closed without
interfering with dup'ed fd's.
- split out file status flags into its own structure
fs_flags to manage sharing of status flags between
dup'ed file descriptors.
- when duplicating a fd, initialize a new fd_table_entry
for the new fd, but share the status flags via status_flags.
- consolidate the code that sets the underlying system fd
to be non-blocking to a new function _thread_fs_flags_init()
- consolidate the code that sets the underlying system
fd back to blocking into a new function _thread_fs_flags_replace()
This change is needed as a prerequisite to the coming race
and deadlock corrections. okay marc@
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From FreeBSD
'looks ok' fgsch@ miod@
man page reviewed by jmc@
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I've skipped the GNU stuff for now. From Patrick Latifi.
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o Implement _get_curthread() and _set_curthread(). Use it where possible.
o Add missing _thread_[enter|leave]_cancellation_point().
o Add a couple of not yet used vars to pthread_private.h.
o Remove return's from void functions.
This is by no means complete, but instead of doing a big commit, i'll
split it in small ones, minimizing diffs.
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add (broken) mips md stuff
fix some const warnings
add sigaltstack() stub
another hash at getting shlib auto-init to work (mips/elf and i386/a.out)
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guenther
kurt
deraadt
brad
millert
fgsch
d