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| Threads Library Functions | td_ta_sync_iter(3THR) |
| | td_ta_sync_iter, td_ta_thr_iter, td_ta_tsd_iter - iterator functions on process handles from libthread_db |
SYNOPSIS
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cc [ flag ... ] file ... -lthread_db [ library ... ]
#include <proc_service.h>
#include <thread_db.h> typedef int td_sync_iter_f(const td_synchandle_t *sh_p, void *cbdata_p); |
| | typedef int td_thr_iter_f(const td_thrhandle_t *th_p, void *cbdata_p); |
| | typedef int td_key_iter_f(thread_key_t key, void (*destructor)(), void *cbdata_p); |
| | td_err_e td_ta_sync_iter(const td_thragent_t *ta_p, td_sync_iter_f *cb, void *cbdata_p); |
| | td_err_e td_ta_thr_iter(const td_thragent_t *ta_p, td_thr_iter_f *cb, void *cbdata_p, td_thr_state_e state, int ti_pri, sigset_t *ti_sigmask_p, unsigned ti_user_flags); |
| | td_err_e td_ta_tsd_iter(const td_thragent_t *ta_p, td_key_iter_f *cb, void *cbdata_p); |
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The td_ta_sync_iter(), td_ta_thr_iter(), and td_ta_tsd_iter() functions are iterator functions that when given a target process handle as an argument, return sets of handles for objects associated with the target process. The method is to
call back a client-provided function once for each associated object, passing back a handle as well as the client-provided pointer cb_data_p. This enables a client to easily build a linked list of the associated objects. If the client-provided function returns non-zero, the
iteration terminates, even if there are members remaining in the set of associated objects.
The td_ta_sync_iter() function returns handles of synchronization objects (mutexes, readers-writer locks, semaphores, and condition variables) associated with a process. Some synchronization objects might not be known to libthread_db and will not be returned.
If the process has initialized the synchronization object (by calling mutex_init(3THR), for example) or a thread in the process has called a synchronization primitive (mutex_lock(), for example) using this object after td_ta_new(3THR) was called to attach to the process and td_ta_sync_tracking_enable() (see td_sync_get_info(3THR)) was called to enable synchronization object tracking, then a handle for the synchronization object will be passed to the callback function. See td_sync_get_info(3THR) for operations that can be performed on synchronization object handles.
The td_ta_thr_iter() function returns handles for threads that are part of the target process. For td_ta_thr_iter(), the caller specifies several criteria to select a subset of threads for which the callback function should be called. Any of these selection
criteria may be wild-carded. If all of them are wild-carded, then handles for all threads in the process will be returned.
The selection parameters and corresponding wild-card values are:
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state (TD_THR_ANY_STATE):
- Select only threads whose state matches state. See td_thr_get_info(3THR)
for a list of thread states.
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ti_pri (TD_THR_LOWEST_PRIORITY):
- Select only threads for which the priority is at least ti_pri.
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ti_sigmask_p (TD_SIGNO_MASK):
- Select only threads whose signal mask exactly matches *ti_sigmask_p.
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ti_user_flags (TD_THR_ANY_USER_FLAGS):
- Select only threads whose user flags (specified at thread creation time) exactly match ti_user_flags.
The td_ta_tsd_iter() function returns the thread-specific data keys in use by the current process. Thread-specific data for a particular thread and key can be obtained by calling td_thr_tsd(3THR).
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TD_OK
- The call completed successfully.
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TD_BADTA
- An invalid process handle was passed in.
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TD_DBERR
- A call to one of the imported interface routines failed.
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TD_ERR
- The call did not complete successfully.
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See attributes(5) for description of the following attributes:
| ATTRIBUTE TYPE | ATTRIBUTE VALUE |
| MT-Level | Safe |
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