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* [newlib-cygwin] Cygwin: pthread: Take note of schedparam in pthread_create
@ 2023-07-09 16:01 Jon Turney
0 siblings, 0 replies; 2+ messages in thread
From: Jon Turney @ 2023-07-09 16:01 UTC (permalink / raw)
To: cygwin-cvs
https://sourceware.org/git/gitweb.cgi?p=newlib-cygwin.git;h=3d6d9d0253c72bd3b7283022bda4e9e9595fbae8
commit 3d6d9d0253c72bd3b7283022bda4e9e9595fbae8
Author: Jon Turney <jon.turney@dronecode.org.uk>
Date: Thu Jul 6 16:39:13 2023 +0100
Cygwin: pthread: Take note of schedparam in pthread_create
Take note of schedparam in any pthread_attr_t passed to pthread_create.
postcreate() (racily, after the thread is actually created), sets the
scheduling priority if it's inherited, but precreate() doesn't store any
scheduling priority explicitly set via a non-default attr to create.
Question: What is the mechanism which sets pthread::attr to defaults
when newattr isn't provided?
Diff:
---
winsup/cygwin/thread.cc | 1 +
1 file changed, 1 insertion(+)
diff --git a/winsup/cygwin/thread.cc b/winsup/cygwin/thread.cc
index f614e01c4..afddf4282 100644
--- a/winsup/cygwin/thread.cc
+++ b/winsup/cygwin/thread.cc
@@ -457,6 +457,7 @@ pthread::precreate (pthread_attr *newattr)
attr.joinable = newattr->joinable;
attr.contentionscope = newattr->contentionscope;
attr.inheritsched = newattr->inheritsched;
+ attr.schedparam = newattr->schedparam;
attr.stackaddr = newattr->stackaddr;
attr.stacksize = newattr->stacksize;
attr.guardsize = newattr->guardsize;
^ permalink raw reply [flat|nested] 2+ messages in thread
* [newlib-cygwin] Cygwin: pthread: Take note of schedparam in pthread_create
@ 2023-07-18 13:19 Jon Turney
0 siblings, 0 replies; 2+ messages in thread
From: Jon Turney @ 2023-07-18 13:19 UTC (permalink / raw)
To: cygwin-cvs
https://sourceware.org/git/gitweb.cgi?p=newlib-cygwin.git;h=c431f6b7fe11edc1e1cb1a8aec1205ca1713402b
commit c431f6b7fe11edc1e1cb1a8aec1205ca1713402b
Author: Jon Turney <jon.turney@dronecode.org.uk>
Date: Thu Jul 6 16:39:13 2023 +0100
Cygwin: pthread: Take note of schedparam in pthread_create
Take note of schedparam in any pthread_attr_t passed to pthread_create.
postcreate() (racily, after the thread is actually created), sets the
scheduling priority if it's inherited, but precreate() doesn't store any
scheduling priority explicitly set via a non-default attr to
pthread_create, so schedparam.sched_priority has the default value of 0.
(I think this is another long-standing bug exposed by 4b51e4c1. Now we
don't lie about the actual thread priority, it's apparent it's not
really being set in this case.)
Fixes testcase priority2.
Signed-off-by: Jon Turney <jon.turney@dronecode.org.uk>
Diff:
---
winsup/cygwin/thread.cc | 1 +
1 file changed, 1 insertion(+)
diff --git a/winsup/cygwin/thread.cc b/winsup/cygwin/thread.cc
index f614e01c4..afddf4282 100644
--- a/winsup/cygwin/thread.cc
+++ b/winsup/cygwin/thread.cc
@@ -457,6 +457,7 @@ pthread::precreate (pthread_attr *newattr)
attr.joinable = newattr->joinable;
attr.contentionscope = newattr->contentionscope;
attr.inheritsched = newattr->inheritsched;
+ attr.schedparam = newattr->schedparam;
attr.stackaddr = newattr->stackaddr;
attr.stacksize = newattr->stacksize;
attr.guardsize = newattr->guardsize;
^ permalink raw reply [flat|nested] 2+ messages in thread
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2023-07-09 16:01 [newlib-cygwin] Cygwin: pthread: Take note of schedparam in pthread_create Jon Turney
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