TAU_REGISTER_FORK(3) TAU Instrumentation API TAU_REGISTER_FORK(3)NAME
TAU_REGISTER_FORK - Informs the measurement system that a fork has taken place
SYNOPSIS
C/C++:
TAU_REGISTER_FORK(int pid, enum TauFork_t option);
DESCRIPTION
To register a child process obtained from the fork() syscall, invoke the TAU_REGISTER_FORK macro. It takes two parameters, the first is the
node id of the child process (typically the process id returned by the fork call or any 0..N-1 range integer). The second parameter
specifies whether the performance data for the child process should be derived from the parent at the time of fork (
TAU_INCLUDE_PARENT_DATA ) or should be independent of its parent at the time of fork ( TAU_EXCLUDE_PARENT_DATA ). If the process id is used
as the node id, before any analysis is done, all profile files should be converted to contiguous node numbers (from 0..N-1). It is highly
recommended to use flat contiguous node numbers in this call for profiling and tracing.
EXAMPLE
C/C++ :
pID = fork();
if (pID == 0) {
printf("Parent : pid returned %d
", pID)
} else {
// If we'd used the TAU_INCLUDE_PARENT_DATA, we get
// the performance data from the parent in this process
// as well.
TAU_REGISTER_FORK(pID, TAU_EXCLUDE_PARENT_DATA);
printf("Child : pid = %d", pID);
}
08/31/2005 TAU_REGISTER_FORK(3)
Check Out this Related Man Page
PTHREAD_ATFORK(3) Library Functions Manual PTHREAD_ATFORK(3)NAME
pthread_atfork - register handlers to be called at fork(2) time
SYNOPSIS
#include <pthread.h>
int pthread_atfork(void (*prepare)(void), void (*parent)(void), void (*child)(void));
DESCRIPTION
pthread_atfork registers handler functions to be called just before and just after a new process is created with fork(2). The prepare han-
dler will be called from the parent process, just before the new process is created. The parent handler will be called from the parent
process, just before fork(2) returns. The child handler will be called from the child process, just before fork(2) returns.
One or several of the three handlers prepare, parent and child can be given as NULL, meaning that no handler needs to be called at the cor-
responding point.
pthread_atfork can be called several times to install several sets of handlers. At fork(2) time, the prepare handlers are called in LIFO
order (last added with pthread_atfork, first called before fork), while the parent and child handlers are called in FIFO order (first
added, first called).
To understand the purpose of pthread_atfork, recall that fork(2) duplicates the whole memory space, including mutexes in their current
locking state, but only the calling thread: other threads are not running in the child process. The mutexes are not usable after the fork
and must be initialized with pthread_mutex_init in the child process. This is a limitation of the current implementation and might or
might not be present in future versions.
RETURN VALUE
pthread_atfork returns 0 on success and a non-zero error code on error.
ERRORS
ENOMEM insufficient memory available to register the handlers.
AUTHOR
Xavier Leroy <Xavier.Leroy@inria.fr>
SEE ALSO fork(2), pthread_mutex_lock(3), pthread_mutex_unlock(3).
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