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Special Forums News, Links, Events and Announcements Software Releases - RSS News UpStare 0.9.12 (Default branch)
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Old 09-17-2008
UpStare 0.9.12 (Default branch)
UpStare is a dynamic software updating system for multi-threaded userspace applications that applies immediate updates using stack reconstruction. The program state and the program code are updated immediately in a single step. It is not necessary to wait indefinitely for a quiescent program state. A running algorithm can be updated midstream its execution and resumed from a different point (not necessarily the beginning) of another algorithm. License: Freely Distributable Changes:
This release fixes a critical issue in the runtime in determining which children have died and should be ignored when coordinating an update with children. It also handles non-blocking file descriptors created with open() and pipe(), and calls to select() with a pointer (possibly set to NULL) timeout argument that would block indefinitely. With these changes, the system can update PostgreSQL while multiple clients are connected to it. Image

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LEARN ABOUT SUNOS

sigstack

sigstack(3UCB)					     SunOS/BSD Compatibility Library Functions					    sigstack(3UCB)

NAME

       sigstack - set and/or get signal stack context

SYNOPSIS

       /usr/ucb/cc [ flag ... ] file ...
       #include <signal.h>

       int sigstack( nss,  oss);
       struct sigstack *nss, *oss;

DESCRIPTION

       The sigstack() function allows users to define an alternate stack, called the "signal stack", on which signals are to be processed.  When a
       signal's action indicates its handler should execute on the signal stack (specified with a sigvec(3UCB) call), the system checks to see	if
       the  process  is  currently  executing on that stack.  If the process is not currently executing on the signal stack, the system arranges a
       switch to the signal stack for the duration of the signal handler's execution.

       A signal stack is specified by a sigstack() structure, which includes the following members:

       char  *ss_sp;	    /* signal stack pointer */
       int   ss_onstack;    /* current status */

       The ss_sp member is the initial value to be assigned to the stack pointer when the system switches the process to the  signal  stack.  Note
       that,  on  machines  where  the	stack  grows  downwards in memory, this is not the address of the beginning of the signal stack area.  The
       ss_onstack member is zero or non-zero depending on whether the process is currently executing on the signal stack or not.

       If nss is not a null pointer, sigstack() sets the signal stack state to the value in the sigstack() structure pointed to by nss. If nss	is
       a  null	pointer,  the signal stack state will be unchanged.  If oss is not a null pointer, the current signal stack state is stored in the
       sigstack() structure pointed to by oss.

RETURN VALUES

       Upon successful completion, 0 is returned.  Otherwise, -1 is returned and errno is set to indicate the error.

ERRORS

       The sigstack() function will fail and the signal stack context will remain unchanged if one of the following occurs.

       EFAULT	       Either nss or oss points to memory that is not a valid part of the process address space.

SEE ALSO

       sigaltstack(2), sigvec(3UCB), signal(3C)

WARNINGS

       Signal stacks are not "grown" automatically, as is done for the normal stack.  If the stack overflows unpredictable results may occur.

NOTES

       Use of these interfaces should be restricted to only applications written on BSD platforms.  Use of these interfaces with any of the system
       libraries or in multi-threaded applications is unsupported.

SunOS 5.10							    22 Jan 1997 						    sigstack(3UCB)