1gettid(2) System Calls Manual gettid(2)
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6 gettid - get thread identification
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9 Standard C library (libc, -lc)
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12 #define _GNU_SOURCE
13 #include <unistd.h>
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15 pid_t gettid(void);
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18 gettid() returns the caller's thread ID (TID). In a single-threaded
19 process, the thread ID is equal to the process ID (PID, as returned by
20 getpid(2)). In a multithreaded process, all threads have the same PID,
21 but each one has a unique TID. For further details, see the discussion
22 of CLONE_THREAD in clone(2).
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25 On success, returns the thread ID of the calling thread.
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28 This call is always successful.
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31 Linux.
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34 Linux 2.4.11, glibc 2.30.
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37 The thread ID returned by this call is not the same thing as a POSIX
38 thread ID (i.e., the opaque value returned by pthread_self(3)).
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40 In a new thread group created by a clone(2) call that does not specify
41 the CLONE_THREAD flag (or, equivalently, a new process created by
42 fork(2)), the new process is a thread group leader, and its thread
43 group ID (the value returned by getpid(2)) is the same as its thread ID
44 (the value returned by gettid()).
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47 capget(2), clone(2), fcntl(2), fork(2), get_robust_list(2), getpid(2),
48 ioprio_set(2), perf_event_open(2), sched_setaffinity(2), sched_set‐
49 param(2), sched_setscheduler(2), tgkill(2), timer_create(2)
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53Linux man-pages 6.04 2023-03-30 gettid(2)