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* spawn.cc (child_info_spawn::worker): Add CREATE_BREAKAWAY_FROM_JOB

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to all spawned processes.  Explain why.
This commit is contained in:
Corinna Vinschen 2011-12-07 10:48:17 +00:00
parent 9bab9bfeb5
commit 47de562e7c
2 changed files with 16 additions and 1 deletions
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5
winsup/cygwin/ChangeLog
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@ -1,3 +1,8 @@
2011-12-07 Corinna Vinschen <vinschen@redhat.com>
* spawn.cc (child_info_spawn::worker): Add CREATE_BREAKAWAY_FROM_JOB
to all spawned processes. Explain why.
2011-12-06 Christopher Faylor <me.cygwin2011@cgf.cx>
* fhandler_fifo.cc (fhandler_fifo::wait): Fix stupid typo and actually

12
winsup/cygwin/spawn.cc
View File

@ -452,7 +452,17 @@ child_info_spawn::worker (const char *prog_arg, const char *const *argv,
c_flags = GetPriorityClass (GetCurrentProcess ());
sigproc_printf ("priority class %d", c_flags);
c_flags |= CREATE_SEPARATE_WOW_VDM | CREATE_UNICODE_ENVIRONMENT;
/* We're adding the CREATE_BREAKAWAY_FROM_JOB flag here to workaround issues
with the "Program Compatibility Assistant (PCA) Service" observed on
Windows 7. For some reason, when starting long running sessions from
mintty, the affected svchost.exe process takes more and more memory and
at one point takes over the CPU. At this point the machine becomes
unresponsive. The only way to get back to normal is to stop the entire
mintty session, or to stop the PCA service. However, a process which
is controlled by PCA is part of a compatibility job, which allows child
processes to break away from the job. This helps to avoid this issue. */
c_flags |= CREATE_SEPARATE_WOW_VDM | CREATE_UNICODE_ENVIRONMENT
| CREATE_BREAKAWAY_FROM_JOB;
if (mode == _P_DETACH)
c_flags |= DETACHED_PROCESS;