1*699cd480SApple OSS Distributions<h2>thread_activation_create</h2> 2*699cd480SApple OSS Distributions<hr> 3*699cd480SApple OSS Distributions<p> 4*699cd480SApple OSS Distributions<strong>Function</strong> - Create a thread activation. 5*699cd480SApple OSS Distributions<h3>SYNOPSIS</h3> 6*699cd480SApple OSS Distributions<pre> 7*699cd480SApple OSS Distributions<strong>kern_return_t thread_activation_create</strong> 8*699cd480SApple OSS Distributions <strong>(task_t</strong> <var>task</var>, 9*699cd480SApple OSS Distributions <strong>mach_port_name_t</strong> <var>RPC_port</var>, 10*699cd480SApple OSS Distributions <strong>vm_offset_t</strong> <var>user_stack</var>, 11*699cd480SApple OSS Distributions <strong>vm_size_t</strong> <var>stack_size</var>, 12*699cd480SApple OSS Distributions <strong>thread_act_t</strong> <var>thread_act_t</var><strong>);</strong> 13*699cd480SApple OSS Distributions</pre> 14*699cd480SApple OSS Distributions<h3>PARAMETERS</h3> 15*699cd480SApple OSS Distributions<dl> 16*699cd480SApple OSS Distributions<p> 17*699cd480SApple OSS Distributions<dt> <var>task</var> 18*699cd480SApple OSS Distributions<dd> 19*699cd480SApple OSS Distributions[in task send right] The port for the task that is to contain the new 20*699cd480SApple OSS Distributionsthread activation. 21*699cd480SApple OSS Distributions<p> 22*699cd480SApple OSS Distributions<dt> <var>RPC_port</var> 23*699cd480SApple OSS Distributions<dd> 24*699cd480SApple OSS Distributions[in receive right] A receive right held by the task, or a port set in the 25*699cd480SApple OSS Distributionstask. 26*699cd480SApple OSS Distributions<p> 27*699cd480SApple OSS Distributions<dt> <var>user_stack</var> 28*699cd480SApple OSS Distributions<dd> 29*699cd480SApple OSS Distributions[in scalar] The virtual address in the task to be used as the starting ad- 30*699cd480SApple OSS Distributionsdress of the user-level stack. 31*699cd480SApple OSS Distributions<p> 32*699cd480SApple OSS Distributions<dt> <var>new_act</var> 33*699cd480SApple OSS Distributions<dd> 34*699cd480SApple OSS Distributions[out thread send right] The kernel-assigned name for the new thread ac- 35*699cd480SApple OSS Distributionstivation. 36*699cd480SApple OSS Distributions</dl> 37*699cd480SApple OSS Distributions<h3>DESCRIPTION</h3> 38*699cd480SApple OSS Distributions<p> 39*699cd480SApple OSS DistributionsThe thread_activation_create function creates a thread activation, or 40*699cd480SApple OSS Distributions"empty thread", into which a client thread shuttle can migrate during 41*699cd480SApple OSS DistributionsRPC. The RPC_port must name ei- ther a receive right held by the 42*699cd480SApple OSS Distributionstask, or a port set in the task. The new thread activation will be 43*699cd480SApple OSS Distributionsadded to a pool of activations attached to this port (or port set). 44*699cd480SApple OSS DistributionsIncoming RPC's targeted at the port (or one of the ports in the set) 45*699cd480SApple OSS Distributionscan use any of the activations in the pool. That is, the client 46*699cd480SApple OSS Distributionsthread shuttle will migrate into the specified server task, take one 47*699cd480SApple OSS Distributionsof the thread activations out of the pool, and join up with it for the 48*699cd480SApple OSS Distributionsduration of the RPC. The shuttle will migrate back to the original 49*699cd480SApple OSS Distributionsclient activation at the end of the RPC. If no thread activations are 50*699cd480SApple OSS Distributionsin the pool, RPC will be blocked until one is created in the pool, or 51*699cd480SApple OSS Distributionsan existing one finishes its RPC and returns to the pool. 52*699cd480SApple OSS DistributionsThe new thread activation will begin each RPC using the stack pointer 53*699cd480SApple OSS Distributionsspecified by user_stack. The kernel neither knows nor cares how big 54*699cd480SApple OSS Distributionsthe specified stack is. 55*699cd480SApple OSS DistributionsWhen a short-circuited RPC (or mach_rpc) is invoked on a port created 56*699cd480SApple OSS Distributionswith mach_port_allocate_subsystem, the RPC will begin execution in the 57*699cd480SApple OSS Distributionssubsystem server at the work function address specified by the port 58*699cd480SApple OSS Distributionsand routine number and looked up in the associated subsystem data. 59*699cd480SApple OSS Distributions<h3>NOTES</h3> 60*699cd480SApple OSS Distributions<p> 61*699cd480SApple OSS DistributionsThe following calls targeted at a thread_act port may _not_ be called 62*699cd480SApple OSS Distributionson an empty thread_act (and will return KERN_INVALID_ARGUMENT if 63*699cd480SApple OSS Distributionsthey are called with one): 64*699cd480SApple OSS Distributionsthread_abort 65*699cd480SApple OSS Distributionsthread_abort_safely 66*699cd480SApple OSS Distributionsthread_depress_abort 67*699cd480SApple OSS Distributionsthread_info 68*699cd480SApple OSS Distributionsthread_wire 69*699cd480SApple OSS DistributionsIn addition, if thread_switch is called with an empty thread_act as 70*699cd480SApple OSS Distributionsits first argument, the argument will be ignored (i.e., the function 71*699cd480SApple OSS Distributionswill behave as if a zero-valued argument had been given). 72*699cd480SApple OSS Distributions<h3>RETURN VALUES</h3> 73*699cd480SApple OSS Distributions<p> 74*699cd480SApple OSS DistributionsOnly generic errors apply. 75*699cd480SApple OSS Distributions<h3>RELATED INFORMATION</h3> 76*699cd480SApple OSS Distributions<p> 77*699cd480SApple OSS DistributionsFunctions: 78*699cd480SApple OSS Distributions<a href="task_create.html"><strong>task_create</strong></a>, 79*699cd480SApple OSS Distributions<a href="MP_allocate_subsystem.html"><strong>mach_port_allocate_subsystem</strong></a>, 80