table of contents
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\n", 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 |