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31 .TH PTHREAD_SETNAME_NP 3 2013\-02\-04 Linux "Linux Programmer's Manual"
33 pthread_setname_np, pthread_getname_np \- スレッド名のの設定/取得を行う
36 \fB#define _GNU_SOURCE\fP /* feature_test_macros(7) 参照 */
37 \fB#include <pthread.h>\fP
38 \fBint pthread_setname_np(pthread_t *\fP\fIthread\fP\fB, const char *\fP\fIname\fP\fB);\fP
39 \fBint pthread_getname_np(pthread_t *\fP\fIthread\fP\fB,\fP
40 \fB const char *\fP\fIname\fP\fB, size_t \fP\fIlen\fP\fB);\fP
43 \fI\-pthread\fP を付けてコンパイルとリンクを行う。
45 By default, all the threads created using \fBpthread_create\fP() inherit the
46 program name. The \fBpthread_setname_np\fP() function can be used to set a
47 unique name for a thread, which can be useful for debugging multithreaded
48 applications. The thread name is a meaningful C language string, whose
49 length is restricted to 16 characters, including the terminating null byte.
50 The \fIthread\fP argument specifies the thread whose name is to be changed;
51 \fIname\fP specifies the new name.
53 The \fBpthread_getname_np\fP() function can be used to retrieve the name of
54 the thread. The \fIthread\fP argument specifies the thread whose name is to be
55 retrieved. The buffer \fIname\fP is used to return the thread name; \fIlen\fP
56 specifies the number of bytes available in \fIname\fP. The buffer specified by
57 \fIname\fP should be at least 16 characters in length. The returned thread
58 name in the output buffer will be null terminated.
63 \fBpthread_setname_np\fP() は以下のエラーで失敗する場合がある。
66 The length of the string specified pointed to by \fIname\fP exceeds the allowed
69 \fBpthread_getname_np\fP() は以下のエラーで失敗する場合がある。
72 The buffer specified by \fIname\fP and \fIlen\fP is too small to hold the thread
75 If either of these functions fails to open \fI/proc/self/task/[tid]/comm\fP,
76 then the call may fail with one of the errors described in \fBopen\fP(2).
78 これらの関数は glibc バージョン 2.12 で初めて登場した。
80 これらの関数は非標準の GNU による拡張である。
82 \fBpthread_setname_np\fP() internally writes to the thread specific comm file
83 under \fI/proc\fP filesystem: \fI/proc/self/task/[tid]/comm\fP.
84 \fBpthread_getname_np\fP() retrieves it from the same location.
87 以下のプログラムは、 \fBpthread_setname_np\fP() と \fBpthread_getname_np\fP()
90 以下のシェルセッションは、このプログラムの実行例である。
95 Created a thread. Default name is: a.out
96 The thread name after setting it is THREADFOO.
97 \fB^Z\fP # Suspend the program
99 $ \fBps H \-C a.out \-o 'pid tid cmd comm'\fP
101 5990 5990 ./a.out a.out
102 5990 5991 ./a.out THREADFOO
103 $ \fBcat /proc/5990/task/5990/comm\fP
105 $ \fBcat /proc/5990/task/5991/comm\fP
122 #define errExitEN(en, msg) \e
123 do { errno = en; perror(msg); exit(EXIT_FAILURE); \e
127 threadfunc(void *parm)
129 sleep(5); // allow main program to set the thread name
134 main(int argc, char **argv)
138 char thread_name[NAMELEN];
140 rc = pthread_create(&thread, NULL, threadfunc, NULL);
142 errExitEN(rc, "pthread_create");
144 rc = pthread_getname_np(thread, thread_name, NAMELEN);
146 errExitEN(rc, "pthread_getname_np");
148 printf("Created a thread. Default name is: %s\en", thread_name);
149 rc = pthread_setname_np(thread, (argc > 1) ? argv[1] : "THREADFOO");
151 errExitEN(rc, "pthread_setname_np");
155 rc = pthread_getname_np(thread, thread_name,
156 (argc > 2) ? atoi(argv[1]) : NAMELEN);
158 errExitEN(rc, "pthread_getname_np");
159 printf("The thread name after setting it is %s.\en", thread_name);
161 rc = pthread_join(thread, NULL);
163 errExitEN(rc, "pthread_join");
172 \fBprctl\fP(2), \fBpthread_create\fP(3), \fBpthreads\fP(7)
174 この man ページは Linux \fIman\-pages\fP プロジェクトのリリース 3.50 の一部
175 である。プロジェクトの説明とバグ報告に関する情報は
176 http://www.kernel.org/doc/man\-pages/ に書かれている。