Pth Scheduling Policy
Hi, I have some doubts regarding the way in which the Pth scheduler implements"Priority basednon-preemptive Scheduling". My program is using the pth "cond" and "mutex" variables for synchronization between the threads. From a low priority thread, I am calling pth_cond_notify() and immediately a higher priority thread (which was there in the ready queue) was getting scheduled. I analyzed the pth_cond_notify () and saw a pth_yield() inside that function. This pth_yield() is "preempting" the lower priority thread that called the pth_cond_notify(). But my application was expecting a pure non-preemptive response. Can I achieve the non-preemptive response if Iremovethe pth_yield() in pth_cond_notify() ? Will there be any performance issue with the Pth library, if I remove the pth_yield () in pth_cond_notify() ? Regards Vinu - Disclaimer - This message(including attachment if any)is confidential and may be privileged.Before opening attachments please check them for viruses and defects.MindTree Consulting Private Limited (MindTree)will not be responsible for any viruses or defects or any forwarded attachments emanating either from within MindTree or outside.If you have received this message by mistake please notify the sender by return e-mail and delete this message from your system. Any unauthorized use or dissemination of this message in whole or in part is strictly prohibited. Please note that e-mails are susceptible to change and MindTree shall not be liable for any improper, untimely or incomplete transmission. -
RE: Pth Scheduling Policy
My program is using the pth cond and mutex variables for synchronization between the threads. From a low priority thread, I am calling pth_cond_notify() and immediately a higher priority thread (which was there in the ready queue) was getting scheduled. Well, that's the purpose of 'pth_cond_notify'. It is, after all, a synchronization function. I think in a non preemptive system, the library cannot force the application to yield the CPU unless the application by itself does an yield. Using pth_cond_notify, a thread just wants to notify another thread that, an event has occurred and it doesn't mean that it should also relinquish the CPU. Its upto that thread whether to continue with the processing or not. Is there any other call in Pth which can be used for sending a notification to a thread, without relinquishing the CPU ? Regards, Vinu - Disclaimer - This message(including attachment if any)is confidential and may be privileged.Before opening attachments please check them for viruses and defects.MindTree Consulting Private Limited (MindTree)will not be responsible for any viruses or defects or any forwarded attachments emanating either from within MindTree or outside.If you have received this message by mistake please notify the sender by return e-mail and delete this message from your system. Any unauthorized use or dissemination of this message in whole or in part is strictly prohibited. Please note that e-mails are susceptible to change and MindTree shall not be liable for any improper, untimely or incomplete transmission. -
Timer Implementation in Pth
Hi,
My requirement is to have a timer implementation using Pth library.
The call shown below causes the callback func to be called at the specified
timeout:
-
---
main_func()
{
pth_ev = pth_event(PTH_EVENT_FUNC, func, NULL, pth_timeout(0,
50));
pth_wait(pth_ev); /* Thread waits here . it is signalled from
callback - func*/
}
However, the execution of the main_func thread is blocked until it is
signalled which happens when the callback is called.
int func(void * arg)
{
/* In timer callback */
}
I need to have a timer implementation similar to timer_init, timer_add,
timer_settime etcwhere the caller does not get blocked.
Is there a way of doing the same using Pth.?
Kind Regards,
Bhanu Kurpad
DISCLAIMER:
This message (including attachment if any) is confidential and may be privileged.
Before opening attachments please check them for viruses and defects. MindTree
Consulting Private Limited (MindTree) will not be responsible for any viruses or
defects or any forwarded attachments emanating either from within MindTree or outside.
If you have received this message by mistake please notify the sender by return
e-mail and delete this message from your system. Any unauthorized use or dissemination
of this message in whole or in part is strictly prohibited. Please note that e-mails
are susceptible to change and MindTree shall not be liable for any improper, untimely
or incomplete transmission.
__
GNU Portable Threads (Pth)http://www.gnu.org/software/pth/
Development Site http://www.ossp.org/pkg/lib/pth/
Distribution Files ftp://ftp.gnu.org/gnu/pth/
Distribution Snapshots ftp://ftp.ossp.org/pkg/lib/pth/
User Support Mailing List[EMAIL PROTECTED]
Automated List Manager (Majordomo) [EMAIL PROTECTED]
Kernel - Pth Thread Communication.
Hi, I am using Pth threads in the user space. I need to make one Pth thread waiting for a kernel event to occur. Could someone suggest me the best methods for implementing this ? Thanks Regards Vinu DISCLAIMER:This message (including attachment if any) is confidential and may be privileged. Before opening attachments please check them for viruses and defects. MindTree Consulting Private Limited (MindTree) will not be responsible for any viruses or defects or any forwarded attachments emanating either from within MindTree or outside. If you have received this message by mistake please notify the sender by return e-mail and delete this message from your system. Any unauthorized use or dissemination of this message in whole or in part is strictly prohibited. Please note that e-mails are susceptible to change and MindTree shall not be liable for any improper, untimely or incomplete transmission.
