* [PATCH v2] add pthread_setname_np
@ 2016-09-17 0:54 Felix Janda
2016-09-17 2:36 ` Rich Felker
2016-10-20 5:49 ` Rich Felker
0 siblings, 2 replies; 3+ messages in thread
From: Felix Janda @ 2016-09-17 0:54 UTC (permalink / raw)
To: musl
the thread name is displayed by gdb's "info threads".
---
v1->v2: add _GNU_SOURCE, and "UL" to prctl arguments
I hope that there are no programs for which this function is
performance critical...
Thanks for the review so far!
---
include/pthread.h | 1 +
src/thread/pthread_setname_np.c | 26 ++++++++++++++++++++++++++
2 files changed, 27 insertions(+)
create mode 100644 src/thread/pthread_setname_np.c
diff --git a/include/pthread.h b/include/pthread.h
index 3d2e0c4..94ef919 100644
--- a/include/pthread.h
+++ b/include/pthread.h
@@ -214,6 +214,7 @@ struct cpu_set_t;
int pthread_getaffinity_np(pthread_t, size_t, struct cpu_set_t *);
int pthread_setaffinity_np(pthread_t, size_t, const struct cpu_set_t *);
int pthread_getattr_np(pthread_t, pthread_attr_t *);
+int pthread_setname_np(pthread_t, const char *);
int pthread_tryjoin_np(pthread_t, void **);
int pthread_timedjoin_np(pthread_t, void **, const struct timespec *);
#endif
diff --git a/src/thread/pthread_setname_np.c b/src/thread/pthread_setname_np.c
new file mode 100644
index 0000000..82d35e1
--- /dev/null
+++ b/src/thread/pthread_setname_np.c
@@ -0,0 +1,26 @@
+#define _GNU_SOURCE
+#include <fcntl.h>
+#include <string.h>
+#include <unistd.h>
+#include <sys/prctl.h>
+
+#include "pthread_impl.h"
+
+int pthread_setname_np(pthread_t thread, const char *name)
+{
+ int fd, cs, status = 0;
+ char f[sizeof "/proc/self/task//comm" + 3*sizeof(int)];
+ size_t len;
+
+ if ((len = strnlen(name, 16)) > 15) return ERANGE;
+
+ if (thread == pthread_self())
+ return prctl(PR_SET_NAME, (unsigned long)name, 0UL, 0UL, 0UL) ? errno : 0;
+
+ snprintf(f, sizeof f, "/proc/self/task/%d/comm", thread->tid);
+ pthread_setcancelstate(PTHREAD_CANCEL_DISABLE, &cs);
+ if ((fd = open(f, O_WRONLY)) < 0 || write(fd, name, len) < 0) status = errno;
+ if (fd >= 0) close(fd);
+ pthread_setcancelstate(cs, 0);
+ return status;
+}
--
2.7.3
^ permalink raw reply [flat|nested] 3+ messages in thread
* Re: [PATCH v2] add pthread_setname_np
2016-09-17 0:54 [PATCH v2] add pthread_setname_np Felix Janda
@ 2016-09-17 2:36 ` Rich Felker
2016-10-20 5:49 ` Rich Felker
1 sibling, 0 replies; 3+ messages in thread
From: Rich Felker @ 2016-09-17 2:36 UTC (permalink / raw)
To: musl
On Fri, Sep 16, 2016 at 08:54:00PM -0400, Felix Janda wrote:
> the thread name is displayed by gdb's "info threads".
> ---
> v1->v2: add _GNU_SOURCE, and "UL" to prctl arguments
>
> I hope that there are no programs for which this function is
> performance critical...
>
> Thanks for the review so far!
> ---
> include/pthread.h | 1 +
> src/thread/pthread_setname_np.c | 26 ++++++++++++++++++++++++++
> 2 files changed, 27 insertions(+)
> create mode 100644 src/thread/pthread_setname_np.c
>
> diff --git a/include/pthread.h b/include/pthread.h
> index 3d2e0c4..94ef919 100644
> --- a/include/pthread.h
> +++ b/include/pthread.h
> @@ -214,6 +214,7 @@ struct cpu_set_t;
> int pthread_getaffinity_np(pthread_t, size_t, struct cpu_set_t *);
> int pthread_setaffinity_np(pthread_t, size_t, const struct cpu_set_t *);
> int pthread_getattr_np(pthread_t, pthread_attr_t *);
> +int pthread_setname_np(pthread_t, const char *);
> int pthread_tryjoin_np(pthread_t, void **);
> int pthread_timedjoin_np(pthread_t, void **, const struct timespec *);
> #endif
> diff --git a/src/thread/pthread_setname_np.c b/src/thread/pthread_setname_np.c
> new file mode 100644
> index 0000000..82d35e1
> --- /dev/null
> +++ b/src/thread/pthread_setname_np.c
> @@ -0,0 +1,26 @@
> +#define _GNU_SOURCE
> +#include <fcntl.h>
> +#include <string.h>
> +#include <unistd.h>
> +#include <sys/prctl.h>
> +
> +#include "pthread_impl.h"
> +
> +int pthread_setname_np(pthread_t thread, const char *name)
> +{
> + int fd, cs, status = 0;
> + char f[sizeof "/proc/self/task//comm" + 3*sizeof(int)];
> + size_t len;
> +
> + if ((len = strnlen(name, 16)) > 15) return ERANGE;
> +
> + if (thread == pthread_self())
> + return prctl(PR_SET_NAME, (unsigned long)name, 0UL, 0UL, 0UL) ? errno : 0;
> +
> + snprintf(f, sizeof f, "/proc/self/task/%d/comm", thread->tid);
> + pthread_setcancelstate(PTHREAD_CANCEL_DISABLE, &cs);
> + if ((fd = open(f, O_WRONLY)) < 0 || write(fd, name, len) < 0) status = errno;
> + if (fd >= 0) close(fd);
> + pthread_setcancelstate(cs, 0);
> + return status;
> +}
> --
> 2.7.3
I don't see anything left that particularly needs changing. I'll see
if anyone else has comments and commit if not.
I did just notice that my hopes that the function could be implemented
with just public APIs aren't met, since thread->tid is needed. But
this could be fixed in the future if there's ever consensus on a
pthread_gettid_np function.
Rich
^ permalink raw reply [flat|nested] 3+ messages in thread
* Re: [PATCH v2] add pthread_setname_np
2016-09-17 0:54 [PATCH v2] add pthread_setname_np Felix Janda
2016-09-17 2:36 ` Rich Felker
@ 2016-10-20 5:49 ` Rich Felker
1 sibling, 0 replies; 3+ messages in thread
From: Rich Felker @ 2016-10-20 5:49 UTC (permalink / raw)
To: musl
On Fri, Sep 16, 2016 at 08:54:00PM -0400, Felix Janda wrote:
> the thread name is displayed by gdb's "info threads".
> ---
> v1->v2: add _GNU_SOURCE, and "UL" to prctl arguments
>
> I hope that there are no programs for which this function is
> performance critical...
>
> Thanks for the review so far!
> ---
> include/pthread.h | 1 +
> src/thread/pthread_setname_np.c | 26 ++++++++++++++++++++++++++
> 2 files changed, 27 insertions(+)
> create mode 100644 src/thread/pthread_setname_np.c
>
> diff --git a/include/pthread.h b/include/pthread.h
> index 3d2e0c4..94ef919 100644
> --- a/include/pthread.h
> +++ b/include/pthread.h
> @@ -214,6 +214,7 @@ struct cpu_set_t;
> int pthread_getaffinity_np(pthread_t, size_t, struct cpu_set_t *);
> int pthread_setaffinity_np(pthread_t, size_t, const struct cpu_set_t *);
> int pthread_getattr_np(pthread_t, pthread_attr_t *);
> +int pthread_setname_np(pthread_t, const char *);
> int pthread_tryjoin_np(pthread_t, void **);
> int pthread_timedjoin_np(pthread_t, void **, const struct timespec *);
> #endif
> diff --git a/src/thread/pthread_setname_np.c b/src/thread/pthread_setname_np.c
> new file mode 100644
> index 0000000..82d35e1
> --- /dev/null
> +++ b/src/thread/pthread_setname_np.c
> @@ -0,0 +1,26 @@
> +#define _GNU_SOURCE
> +#include <fcntl.h>
> +#include <string.h>
> +#include <unistd.h>
> +#include <sys/prctl.h>
> +
> +#include "pthread_impl.h"
> +
> +int pthread_setname_np(pthread_t thread, const char *name)
> +{
> + int fd, cs, status = 0;
> + char f[sizeof "/proc/self/task//comm" + 3*sizeof(int)];
> + size_t len;
> +
> + if ((len = strnlen(name, 16)) > 15) return ERANGE;
> +
> + if (thread == pthread_self())
> + return prctl(PR_SET_NAME, (unsigned long)name, 0UL, 0UL, 0UL) ? errno : 0;
> +
> + snprintf(f, sizeof f, "/proc/self/task/%d/comm", thread->tid);
> + pthread_setcancelstate(PTHREAD_CANCEL_DISABLE, &cs);
> + if ((fd = open(f, O_WRONLY)) < 0 || write(fd, name, len) < 0) status = errno;
> + if (fd >= 0) close(fd);
> + pthread_setcancelstate(cs, 0);
> + return status;
> +}
> --
> 2.7.3
Committed. Sorry for the delay.
Rich
^ permalink raw reply [flat|nested] 3+ messages in thread
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2016-09-17 0:54 [PATCH v2] add pthread_setname_np Felix Janda
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