Count Number Of Threads in a Process


 
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Old 01-02-2003
SIGLWP signal is used as an inter-LWP signaling mechanism when directed to particular LWPs within the process via the _lwp_kill() interface. It is reserved for the threads packages.

SIGWAITING signal is generated by the kernel when it detects that all the LWPs in the process have blocked in indefinite waits. It is used by threads packages to ensure that processes don't deadlock indefinitely due to lack of execution resources.
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pthread_condattr_getpshared(3T) 										   pthread_condattr_getpshared(3T)

NAME
pthread_condattr_getpshared(), pthread_condattr_setpshared() - get or set the process-shared attribute SYNOPSIS
PARAMETERS
attr Pointer to the condition variable attributes object whose process-shared attribute is to be set/retrieved. pshared This parameter either specifies the new value of the process-shared attribute (set function) or it points to the memory location where the process-shared attribute of attr is to be returned (get function). DESCRIPTION
The attributes object attr must have been previously initialized with the function before these functions are called. The functions are used to set and retrieve the process-shared attribute in a condition variable attributes object. The legal values for the process-shared attribute are: This option permits a condition variable to be operated upon by any thread that has access to the memory where the condition variable is allocated. The application is responsible for allocating the condition variable in memory that multiple processes can access. The condition variable can be operated on only by threads created within the same process as the thread that initialized the condition variable. If threads of differing processes attempt to operate on such condition variable, the behavior is undefined. The default value of process-shared is sets the process-shared attribute in attr. The new value of the process-shared attribute of attr is set to the value specified in the pshared parameter. retrieves the value of the process-shared attribute from attr. The value of the process-shared attribute of attr is returned in the pshared parameter. RETURN VALUE
Upon successful completion, and return zero. Otherwise, an error number is returned to indicate the error (the variable is not set). ERRORS
If any of the following occur, the and functions return the corresponding error number: is not defined and these functions are not supported. For each of the following conditions, if the condition is detected, the function returns the corresponding error number: attr is not a valid condition variable attributes object. The value specified by pshared is not a legal value. For each of the following conditions, if the condition is detected, the function returns the corresponding error number: The value specified by attr or pshared is invalid. WARNINGS
If a condition variable is created with the process-shared attribute defined as the cooperating processes should have access to the memory in which the condition variable is allocated. AUTHOR
and were derived from the IEEE POSIX P1003.1c standard. SEE ALSO
pthread_create(3T), pthread_condattr_init(3T), pthread_cond_init(3T), pthread_mutex_init(3T). STANDARDS CONFORMANCE
Pthread Library pthread_condattr_getpshared(3T)