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1 | .\" Copyright (c) 2008 Linux Foundation, written by Michael Kerrisk |
2 | .\" <mtk.manpages@gmail.com> | |
3 | .\" | |
93015253 | 4 | .\" %%%LICENSE_START(VERBATIM) |
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5 | .\" Permission is granted to make and distribute verbatim copies of this |
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9 | .\" Permission is granted to copy and distribute modified versions of this | |
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4b72fb64 | 24 | .\" %%%LICENSE_END |
b290aa63 | 25 | .\" |
48718eb3 | 26 | .TH PTHREAD_DETACH 3 2008-11-27 "Linux" "Linux Programmer's Manual" |
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27 | .SH NAME |
28 | pthread_detach \- detach a thread | |
29 | .SH SYNOPSIS | |
30 | .nf | |
31 | .B #include <pthread.h> | |
32 | ||
33 | .BI "int pthread_detach(pthread_t " thread ); | |
34 | .fi | |
35 | .sp | |
36 | Compile and link with \fI\-pthread\fP. | |
37 | .SH DESCRIPTION | |
38 | The | |
39 | .BR pthread_detach () | |
40 | function marks the thread identified by | |
41 | .IR thread | |
42 | as detached. | |
43 | When a detached thread terminates, | |
44 | its resources are automatically released back to the system without | |
5de8e5f9 | 45 | the need for another thread to join with the terminated thread. |
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46 | |
47 | Attempting to detach an already detached thread results | |
48 | in unspecified behavior. | |
49 | .SH RETURN VALUE | |
50 | On success, | |
51 | .BR pthread_detach () | |
52 | returns 0; | |
53 | on error, it returns an error number. | |
54 | .SH ERRORS | |
55 | .TP | |
56 | .B EINVAL | |
57 | .I thread | |
58 | is not a joinable thread. | |
59 | .TP | |
60 | .B ESRCH | |
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61 | No thread with the ID |
62 | .I thread | |
63 | could be found. | |
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64 | .SH CONFORMING TO |
65 | POSIX.1-2001. | |
66 | .SH NOTES | |
67 | Once a thread has been detached, it can't be joined with | |
68 | .BR pthread_join (3) | |
69 | or be made joinable again. | |
70 | ||
71 | A new thread can be created in a detached state using | |
72 | .BR pthread_attr_setdetachstate (3) | |
73 | to set the detached attribute of the | |
74 | .I attr | |
75 | argument of | |
76 | .BR pthread_create (3). | |
77 | ||
78 | The detached attribute merely determines the behavior of the system | |
79 | when the thread terminates; | |
80 | it does not prevent the thread from being terminated | |
81 | if the process terminates using | |
82 | .BR exit (3) | |
83 | (or equivalently, if the main thread returns). | |
84 | ||
85 | Either | |
86 | .BR pthread_join (3) | |
87 | or | |
88 | .BR pthread_detach () | |
89 | should be called for each thread that an application creates, | |
90 | so that system resources for the thread can be released. | |
91 | (But note that the resources of all threads are freed when the | |
92 | process terminates.) | |
93 | .SH EXAMPLE | |
94 | The following statement detaches the calling thread: | |
95 | ||
96 | pthread_detach(pthread_self()); | |
97 | .SH SEE ALSO | |
98 | .BR pthread_attr_setdetachstate (3), | |
99 | .BR pthread_cancel (3), | |
100 | .BR pthread_create (3), | |
101 | .BR pthread_exit (3), | |
102 | .BR pthread_join (3), | |
103 | .BR pthreads (7) |