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.Dd January 31, 2003 .Dt PTHREAD_ATTR_GET_NP 3 .Os .Sh NAME .Nm pthread_attr_get_np .Nd get attributes of existent thread .Sh LIBRARY .Lb libpthread .Sh SYNOPSIS n pthread_np.h .Ft int .Fn pthread_attr_get_np "pthread_t pid" "pthread_attr_t *dst" .Sh DESCRIPTION The .Fn pthread_attr_get_np function is used to get existent thread's attributes. Most fields of .Vt pthread_attr_t structure are exact values of attributes provided at thread creation time (as parameter to .Xr pthread_create 3 function), except for the stack address.
p Value returned as .Fa dst is supposed to be used in conjunction with .Fn pthread_attr_get* functions to retrieve individual values from .Vt pthread_attr_t structure. Parameter .Fa dst should point to allocated memory area big enough to fit this structure.
p It is HIGHLY RECOMMENDED to use .Xr pthread_attr_init 3 function to allocate attribute storage. .Sh IMPLEMENTATION NOTES The .Fn pthread_attr_get_np function will always return a pointer to the thread's real stack address, regardless of its value in the original attributes structure. .Sh RETURN VALUES If successful, .Fn pthread_attr_get_np function returns 0. Otherwise, an error number is returned to indicate the error. .Sh EXAMPLES d -literal size_t my_thread_stack_size(pthread_t pid) { pthread_attr_t attr; size_t size; pthread_attr_init(&attr); pthread_attr_get_np(pid, &attr); pthread_attr_getstacksize(&attr, &size); pthread_attr_destroy(&attr); return(size); } .Ed .Sh ERRORS The .Fn pthread_attr_get_np function will fail if: l -tag -width Er t Bq Er EINVAL Invalid value for one of given parameters. t Bq Er ESRC No thread could be found corresponding to that specified by the given thread ID. .El .Sh SEE ALSO .Xr pthread_attr_destroy 3 , .Xr pthread_attr_getdetachstate 3 , .Xr pthread_attr_getinheritsched 3 , .Xr pthread_attr_getschedparam 3 , .Xr pthread_attr_getschedpolicy 3 , .Xr pthread_attr_getscope 3 , .Xr pthread_attr_getstack 3 , .Xr pthread_attr_getstackaddr 3 , .Xr pthread_attr_getstacksize 3 , .Xr pthread_attr_init 3 .Sh AUTHORS The .Fn pthread_attr_get_np function and this manual page were written by .An Alexey Zelkin .Aq phantom@FreeBSD.org .