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Cygwin: sigproc: Allow more child processes per process

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256 children per process is a bit tight in some scenarios.

Fix this by revamping the `procs' array.  Convert it to an
extensible class child_procs and rename procs to chld_procs.
Fix code throughout to use matching class methods rather than
direct access.

To allow a lot more child processes while trying to avoid
allocations at DLL startup, maintain two arrays within class
child_procs, one using a default size for 255 (i686) or 1023
(x86_64) children, the other, dynamically allocated on overflowing
the first array, giving room for another 1023 (i686) or 4095
(x86_64) processes.

On testing with a simple reproducer on a x86_64 machine with
4 Gigs RAM, a system memory overflow occured after forking
about 1450 child processes, so this simple dynamic should
suffice for a while.

Signed-off-by: Corinna Vinschen <corinna@vinschen.de>
This commit is contained in:
Corinna Vinschen
2020-08-28 15:22:58 +02:00
parent 163daed37c
commit 7c963c7ba0
2 changed files with 93 additions and 54 deletions
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2
winsup/cygwin/child_info.h
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@@ -39,8 +39,6 @@ enum child_status
/* Change this value if you get a message indicating that it is out-of-sync. */
#define CURR_CHILD_INFO_MAGIC 0xecc930b9U
#define NPROCS 256
#include "pinfo.h"
struct cchildren
{