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|
// $Id$
// Process_Manager.cpp
#define ACE_BUILD_DLL
#include "ace/Synch_T.h"
#include "ace/Process.h"
#include "ace/Signal.h"
#include "ace/Process_Manager.h"
#include "ace/Object_Manager.h"
#if !defined (__ACE_INLINE__)
#include "ace/Process_Manager.i"
#endif /* __ACE_INLINE__ */
ACE_RCSID(ace, Process_Manager, "$Id$")
ACE_ALLOC_HOOK_DEFINE(ACE_Process_Manager)
// Singleton instance.
ACE_Process_Manager *ACE_Process_Manager::instance_ = 0;
// Controls whether the <Process_Manager> is deleted when we shut down
// (we can only delete it safely if we created it!)
int ACE_Process_Manager::delete_instance_ = 0;
ACE_Process_Descriptor::~ACE_Process_Descriptor (void)
{
}
void
ACE_Process_Descriptor::dump (void) const
{
ACE_TRACE ("ACE_Process_Descriptor::dump");
ACE_DEBUG ((LM_DEBUG, ACE_BEGIN_DUMP, this));
ACE_DEBUG ((LM_DEBUG, ASYS_TEXT ("\nproc_id_ = %d"),
this->process_->getpid( )));
ACE_DEBUG ((LM_DEBUG, ACE_END_DUMP));
}
void
ACE_Process_Manager::dump (void) const
{
ACE_TRACE ("ACE_Process_Manager::dump");
ACE_DEBUG ((LM_DEBUG, ACE_BEGIN_DUMP, this));
ACE_DEBUG ((LM_DEBUG, ASYS_TEXT ("\nmax_process_table_size_ = %d"), this->max_process_table_size_));
ACE_DEBUG ((LM_DEBUG, ASYS_TEXT ("\ncurrent_count_ = %d"), this->current_count_));
for (size_t i = 0; i < this->current_count_; i++)
this->process_table_[i].dump ();
ACE_DEBUG ((LM_DEBUG, ACE_END_DUMP));
}
ACE_Process_Descriptor::ACE_Process_Descriptor (void)
: delete_process_ (0),
process_ (0),
exit_notify_ (0)
{
ACE_TRACE ("ACE_Process_Descriptor::ACE_Process_Descriptor");
}
ACE_Process_Manager *
ACE_Process_Manager::instance (void)
{
ACE_TRACE ("ACE_Process_Manager::instance");
if (ACE_Process_Manager::instance_ == 0)
{
// Perform Double-Checked Locking Optimization.
ACE_MT (ACE_GUARD_RETURN (ACE_Recursive_Thread_Mutex, ace_mon,
*ACE_Static_Object_Lock::instance (), 0));
if (ACE_Process_Manager::instance_ == 0)
{
ACE_NEW_RETURN (ACE_Process_Manager::instance_,
ACE_Process_Manager,
0);
ACE_Process_Manager::delete_instance_ = 1;
}
}
return ACE_Process_Manager::instance_;
}
ACE_Process_Manager *
ACE_Process_Manager::instance (ACE_Process_Manager *tm)
{
ACE_TRACE ("ACE_Process_Manager::instance");
ACE_MT (ACE_GUARD_RETURN (ACE_Recursive_Thread_Mutex, ace_mon,
*ACE_Static_Object_Lock::instance (), 0));
ACE_Process_Manager *t = ACE_Process_Manager::instance_;
// We can't safely delete it since we don't know who created it!
ACE_Process_Manager::delete_instance_ = 0;
ACE_Process_Manager::instance_ = tm;
return t;
}
int
ACE_Process_Manager::resize (size_t size)
{
ACE_TRACE ("ACE_Process_Manager::resize");
ACE_Process_Descriptor *temp;
ACE_NEW_RETURN (temp,
ACE_Process_Descriptor[size],
-1);
for (size_t i = 0;
i < this->current_count_;
i++)
// Structure assignment.
temp[i] = this->process_table_[i];
this->max_process_table_size_ = size;
delete [] this->process_table_;
this->process_table_ = temp;
return 0;
}
// Create and initialize the table to keep track of the process pool.
int
ACE_Process_Manager::open (size_t size,
ACE_Reactor *r)
{
ACE_TRACE ("ACE_Process_Manager::open");
if (r)
{
ACE_Event_Handler::reactor (r);
#if !defined(ACE_WIN32)
// (No signals for child-exited on Win32) Assign the
// Process_Manager a dummy I/O descriptor. Note that even
// though we open this file "Write Only" we still need to use
// the ACE_Event_Handler::NULL_MASK when registering this with
// the ACE_Reactor (see below).
this->dummy_handle_ = ACE_OS::open (ACE_DEV_NULL,
O_WRONLY);
ACE_ASSERT (this->dummy_handle_ != ACE_INVALID_HANDLE);
// Register signal handler object. Note that NULL_MASK is used
// to keep the ACE_Reactor from calling us back on the
// "/dev/null" descriptor. NULL_MASK just reserves a "slot" in
// the Reactor's internal demuxing table, but doesn't cause it
// to dispatch the event handler directly. Instead, we use the
// signal handler to do this.
if (reactor ()->register_handler
(this,
ACE_Event_Handler::NULL_MASK) == -1)
ACE_ERROR ((LM_ERROR,
"%p\n%a",
"register_handler",
1));
if (reactor ()->register_handler
(SIGCHLD, this) == -1)
ACE_ERROR ((LM_ERROR,
"%p\n%a",
"register_handler",
1));
#endif // !defined(ACE_WIN32)
}
ACE_MT (ACE_GUARD_RETURN (ACE_Thread_Mutex, ace_mon, this->lock_, -1));
if (this->max_process_table_size_ < size)
this->resize (size);
return 0;
}
// Initialize the synchronization variables.
ACE_Process_Manager::ACE_Process_Manager (size_t size,
ACE_Reactor *r)
: ACE_Event_Handler (),
process_table_ (0),
max_process_table_size_ (0),
current_count_ (0),
#if !defined(ACE_WIN32)
dummy_handle_ (ACE_INVALID_HANDLE),
#endif // !defined(ACE_WIN32)
default_exit_handler_ (0)
#if defined (ACE_HAS_THREADS)
, lock_ ()
#endif /* ACE_HAS_THREADS */
{
ACE_TRACE ("ACE_Process_Manager::ACE_Process_Manager");
if (this->open (size,
r) == -1)
ACE_ERROR ((LM_ERROR,
ASYS_TEXT ("%p\n"),
ASYS_TEXT ("ACE_Process_Manager")));
}
// Close up and release all resources.
int
ACE_Process_Manager::close (void)
{
ACE_TRACE ("ACE_Process_Manager::close");
if (this->reactor ())
{
this->reactor ()->remove_handler (this, 0);
this->reactor (0);
}
ACE_MT (ACE_GUARD_RETURN (ACE_Thread_Mutex, ace_mon, this->lock_, -1));
if (this->process_table_ != 0)
{
for (size_t i = 0; i < this->current_count_; ++i)
{
if (this->process_table_[i].exit_notify_ != 0)
this->process_table_[i].exit_notify_->handle_close
(this->process_table_[i].process_->gethandle (),
0);
}
delete [] this->process_table_;
this->process_table_ = 0;
this->max_process_table_size_ = 0;
this->current_count_ = 0;
}
if (this->default_exit_handler_ != 0)
this->default_exit_handler_->handle_close (ACE_INVALID_HANDLE,0);
this->default_exit_handler_ = 0;
return 0;
}
ACE_Process_Manager::~ACE_Process_Manager (void)
{
ACE_TRACE ("ACE_Process_Manager::~ACE_Process_Manager");
this->close ();
}
// This is called when the Reactor notices that a Process has exited.
// On Windoze, it knows which Process it was, and passes the Process'
// handle. On Unix, what has actually happened is a SIGCHLD invoked
// the handle_signal routine, which fooled the Reactor into thinking
// that this routine needed to be called. (On Unix, we reap as many
// children as are dead.)
int
ACE_Process_Manager::handle_input (ACE_HANDLE proc)
{
ACE_TRACE ("ACE_Process_Manager::handle_input");
#if defined(ACE_WIN32)
ACE_exitcode status = 0;
BOOL result = ::GetExitCodeProcess (proc,
&status);
if (result)
{
if (status != STILL_ACTIVE)
{
{
ACE_MT (ACE_GUARD_RETURN (ACE_Thread_Mutex, ace_mon, lock_, -1));
ssize_t i = this->find_proc (proc);
pid_t pid = i != -1
? process_table_[i].process_->getpid ()
: ACE_INVALID_PID;
this->notify_proc_handler (proc, pid, status);
this->remove_proc (pid);
}
ACE_Reactor *r = this->reactor ();
if (r)
r->remove_handler (proc, 0);
}
else
ACE_ERROR_RETURN ((LM_ERROR,
ASYS_TEXT ("Process still active -- shouldn't have been called yet!\n")),
-1);
}
else
{
// <GetExitCodeProcess> failed.
ACE_ERROR ((LM_ERROR,
"%p\n%a",
"handle_input: GetExitCodeProcess failed",
0));
}
#else /* !defined(ACE_WIN32) */
ACE_UNUSED_ARG (proc); // proc is dummy_handle_ on unix.
pid_t pid;
do
pid = this->wait (0, ACE_Time_Value::zero);
while (pid != 0 && pid != ACE_INVALID_PID);
#endif /* defined (ACE_WIN32) */
return 0;
}
#if !defined (ACE_WIN32)
ACE_HANDLE
ACE_Process_Manager::get_handle (void) const
{
return this->dummy_handle_;
}
int
ACE_Process_Manager::handle_signal (int,
siginfo_t *,
ucontext_t *)
{
return reactor ()->ready_ops
(this->dummy_handle_,
ACE_Event_Handler::READ_MASK,
ACE_Reactor::ADD_MASK);
}
#endif /* !ACE_WIN32 */
int
ACE_Process_Manager::register_handler (ACE_Event_Handler *eh,
pid_t pid)
{
ACE_MT (ACE_GUARD_RETURN (ACE_Thread_Mutex, ace_mon, this->lock_, -1));
if (pid == ACE_INVALID_PID)
{
if (this->default_exit_handler_ != 0)
this->default_exit_handler_->handle_close (ACE_INVALID_HANDLE,
0);
this->default_exit_handler_ = eh;
return 0;
}
ssize_t i = this->find_proc (pid);
if (i == -1)
// set "process not found" error
return -1;
else
{
ACE_Process_Descriptor &proc_desc = this->process_table_[i];
if (proc_desc.exit_notify_ != 0)
proc_desc.exit_notify_->handle_close (ACE_INVALID_HANDLE,
0);
proc_desc.exit_notify_ = eh;
return 0;
}
}
int
ACE_Process_Manager::handle_close (ACE_HANDLE handle,
ACE_Reactor_Mask)
{
ACE_TRACE ("ACE_Process_Manager::handle_close");
ACE_UNUSED_ARG (handle);
#if !defined (ACE_WIN32)
ACE_ASSERT (handle == this->dummy_handle_);
ACE_OS::close (dummy_handle_);
#endif /* ACE_WIN32 */
return 0;
}
// Create a new process.
pid_t
ACE_Process_Manager::spawn (ACE_Process_Options &options)
{
ACE_Process *process = new ACE_Process;
options.setgroup (ACE_OS::getpid ());
pid_t pid = spawn (process, options);
if (pid != ACE_INVALID_PID)
{
ACE_MT (ACE_GUARD_RETURN (ACE_Thread_Mutex, ace_mon, this->lock_, ACE_INVALID_PID));
ssize_t i = this->find_proc (pid);
ACE_ASSERT (i != -1);
this->process_table_[i].delete_process_ = 1;
}
return pid;
}
// Create a new process.
pid_t
ACE_Process_Manager::spawn (ACE_Process *process,
ACE_Process_Options &options)
{
ACE_TRACE ("ACE_Process_Manager::spawn");
pid_t pid = process->spawn (options);
// Only include the pid in the parent's table.
if (pid == ACE_INVALID_PID
|| pid == 0)
return pid;
else
{
ACE_MT (ACE_GUARD_RETURN (ACE_Thread_Mutex, ace_mon, this->lock_, -1));
if (this->append_proc (process) == -1)
// bad news: spawned, but not registered in table.
return ACE_INVALID_PID;
else
return pid;
}
}
// Create N new processs.
int
ACE_Process_Manager::spawn_n (size_t n,
ACE_Process_Options &options,
pid_t *child_pids)
{
ACE_TRACE ("ACE_Process_Manager::spawn_n");
if (child_pids != 0)
for (size_t i = 0;
i < n;
++i)
child_pids[i] = ACE_INVALID_PID;
for (size_t i = 0;
i < n;
i++)
{
pid_t pid = this->spawn (options);
if (pid == ACE_INVALID_PID || pid == 0)
// We're in the child or something's gone wrong.
return pid;
else if (child_pids != 0)
child_pids[i] = pid;
}
return 0;
}
// Append a process into the pool (does not check for duplicates).
// Must be called with locks held.
int
ACE_Process_Manager::append_proc (ACE_Process *proc)
{
ACE_TRACE ("ACE_Process_Manager::append_proc");
// Try to resize the array to twice its existing size if we run out
// of space...
if (this->current_count_ >= this->max_process_table_size_
&& this->resize (this->max_process_table_size_ * 2) == -1)
return -1;
else
{
ACE_Process_Descriptor &proc_desc =
this->process_table_[this->current_count_];
// pending better info from caller
proc_desc.delete_process_ = 0;
proc_desc.process_ = proc;
#if defined (ACE_WIN32)
// If we have a Reactor, then we're supposed to reap Processes
// automagically. Get a handle to this new Process and tell the
// Reactor we're interested in <handling_input> on it.
ACE_Reactor *r = this->reactor ();
if (r != 0)
r->register_handler (proc->gethandle (),
this,
ACE_Event_Handler::READ_MASK);
#endif /* ACE_WIN32 */
this->current_count_++;
return 0;
}
}
// Insert a process into the pool (checks for duplicates and doesn't
// allow them to be inserted twice).
int
ACE_Process_Manager::insert_proc (ACE_Process *proc)
{
ACE_TRACE ("ACE_Process_Manager::insert_proc");
// Check for duplicates and bail out if they're already
// registered...
if (this->find_proc (proc->getpid ()) != -1)
return -1;
return this->append_proc (proc);
}
// Remove a process from the pool.
int
ACE_Process_Manager::remove (pid_t pid)
{
ACE_TRACE ("ACE_Process_Manager::remove");
ACE_MT (ACE_GUARD_RETURN (ACE_Thread_Mutex, ace_mon, this->lock_, -1));
return this->remove_proc (pid);
}
// Remove a process from the pool. Must be called with locks held.
int
ACE_Process_Manager::remove_proc (pid_t pid)
{
ACE_TRACE ("ACE_Process_Manager::remove");
ssize_t i = this->find_proc (pid);
if (i == -1)
return -1;
// If there's an exit_notify_ <Event_Handler> for this pid, call its
// <handle_close> method.
if (this->process_table_[i].exit_notify_ != 0)
{
this->process_table_[i].exit_notify_->handle_close
(this->process_table_[i].process_->gethandle(),
0);
this->process_table_[i].exit_notify_ = 0;
}
if (this->process_table_[i].delete_process_)
delete this->process_table_[i].process_;
this->process_table_[i].process_ = 0;
this->current_count_--;
if (this->current_count_ > 0)
// Compact the table by moving the last item into the slot vacated
// by the index being removed (this is a structure assignment).
this->process_table_[i] =
this->process_table_[this->current_count_];
return 0;
}
int
ACE_Process_Manager::terminate (pid_t pid)
{
ACE_TRACE ("ACE_Process_Manager::terminate");
// Check for duplicates and bail out if they're already
// registered...
ssize_t i = this->find_proc (pid);
if (i == -1)
// set "no such process" error
return -1;
int result = ACE::terminate_process (pid);
if (result != -1)
{
// Save/restore errno.
ACE_Errno_Guard error (errno);
this->remove (pid);
return 0;
}
else
return -1;
}
int
ACE_Process_Manager::terminate (pid_t pid,
int sig)
{
ACE_TRACE ("ACE_Process_Manager::terminate");
// Check for duplicates and bail out if they're already
// registered...
ssize_t i = this->find_proc (pid);
if (i == -1)
// set "no such process" error
return -1;
return ACE_OS::kill (pid, sig);
}
// Locate the index in the table associated with <pid>. Must be
// called with the lock held.
ssize_t
ACE_Process_Manager::find_proc (pid_t pid)
{
ACE_TRACE ("ACE_Process_Manager::find_proc");
for (size_t i = 0; i < this->current_count_; ++i)
if (pid == this->process_table_[i].process_->getpid ())
return i;
return -1;
}
#if defined (ACE_WIN32)
// Locate the index in the table associated with <h>. Must be
// called with the lock held.
ssize_t
ACE_Process_Manager::find_proc (ACE_HANDLE h)
{
ACE_TRACE ("ACE_Process_Manager::find_proc");
for (size_t i = 0; i < this->current_count_; ++i)
if (h == this->process_table_[i].process_->gethandle ())
return i;
return -1;
}
#endif /* ACE_WIN32 */
// Wait for all the Processs to exit, or until <timeout> elapses.
// Returns the number of Processes remaining, or -1 on an error.
int
ACE_Process_Manager::wait (const ACE_Time_Value &timeout)
{
ACE_TRACE ("ACE_Process_Manager::wait");
ACE_Time_Value until = timeout;
ACE_Time_Value remaining = timeout;
if (until < ACE_Time_Value::max_time)
until += ACE_OS::gettimeofday ();
while (current_count_ > 0)
{
pid_t pid = this->wait (0, remaining);
if (pid == ACE_INVALID_PID) // wait() failed
return -1;
else if (pid == 0) // timeout
break;
remaining = until < ACE_Time_Value::max_time
? until - ACE_OS::gettimeofday ()
: ACE_Time_Value::max_time;
if (remaining <= ACE_Time_Value::zero)
break;
// else Process terminated...wait for more...
}
return current_count_;
}
// Collect a single child process' exit status. Store the exit code
// in *<stat_loc> if non-zero. Call the appropriate exit_notify. If
// <pid> == 0, wait for any of the Process_Manager's children (or as
// near as possible -- on Unix, we might accidentally get some other
// Process_Manager's Process, or an unmanaged Process, or a child
// process started by some other means.
pid_t
ACE_Process_Manager::wait (pid_t pid,
ACE_exitcode *status)
{
ACE_TRACE ("ACE_Process_Manager::wait");
return this->wait (pid,
ACE_Time_Value::max_time,
status);
}
// Collect a single child processes' exit status, unless <timeout>
// elapses before the process exits. Same caveats about accidental
// Process reaping on Unix as above.
pid_t
ACE_Process_Manager::wait (pid_t pid,
const ACE_Time_Value &timeout,
ACE_exitcode *status)
{
ACE_TRACE ("ACE_Process_Manager::wait");
ACE_exitcode local_stat = 0;
if (status == 0)
status = &local_stat;
ACE_Process *proc = 0;
ACE_MT (ACE_GUARD_RETURN (ACE_Thread_Mutex, ace_mon, this->lock_, -1));
if (pid != 0)
{
ssize_t i = this->find_proc (pid);
if (i == -1)
return ACE_INVALID_PID;
else
proc = process_table_[i].process_;
}
if (proc != 0)
pid = proc->wait (timeout, status);
else
{
// Wait for any Process spawned by this Process_Manager.
#if defined (ACE_WIN32)
HANDLE *handles;
ACE_NEW_RETURN (handles,
HANDLE[current_count_],
ACE_INVALID_PID);
for (size_t i = 0;
i < current_count_;
++i)
handles[i] =
process_table_[i].process_->gethandle ();
DWORD result = ::WaitForMultipleObjects (current_count_,
handles,
FALSE,
timeout == ACE_Time_Value::max_time
? INFINITE
: timeout.msec ());
if (result == WAIT_FAILED)
pid = ACE_INVALID_PID;
else if (result == WAIT_TIMEOUT)
pid = 0;
else
{
ACE_ASSERT (result >= WAIT_OBJECT_0
&& result < WAIT_OBJECT_0 + current_count_);
ssize_t i = this->find_proc (handles[result - WAIT_OBJECT_0]);
if (i != -1)
{
pid = process_table_[i].process_->getpid ();
result = ::GetExitCodeProcess (handles[result - WAIT_OBJECT_0],
status);
if (result == 0)
{
// <GetExitCodeProcess> failed!
this->remove_proc (pid);
pid = ACE_INVALID_PID;
}
}
else
// uh oh...handle removed from process_table_, even though
// we're holding a lock!
;
}
delete [] handles;
#else /* !defined(ACE_WIN32) */
if (timeout == ACE_Time_Value::max_time)
pid = ACE_OS::waitpid (-(ACE_OS::getpid ()),
status,
0);
else if (timeout == ACE_Time_Value::zero)
pid = ACE_OS::waitpid (-(ACE_OS::getpid ()),
status,
WNOHANG);
else
{
ACE_Time_Value wait_until =
timeout + ACE_OS::gettimeofday();
for (;;)
{
pid = ACE_OS::waitpid (-(ACE_OS::getpid()),
status,
WNOHANG);
if (pid != 0)
// "no such children" error, or got one!
break;
ACE_Sig_Set alarm_or_child;
alarm_or_child.sig_add (SIGALRM);
alarm_or_child.sig_add (SIGCHLD);
ACE_Time_Value time_left = wait_until - ACE_OS::gettimeofday ();
// if ACE_OS::ualarm doesn't have sub-second resolution:
time_left += ACE_Time_Value (0, 500000);
time_left.usec (0);
if (time_left <= ACE_Time_Value::zero) {
pid = 0;
break;
}
ACE_OS::ualarm (time_left);
ACE_OS::sigwait (alarm_or_child);
}
}
#endif /* !defined (ACE_WIN32) */
}
if (pid != ACE_INVALID_PID && pid != 0)
{
if (proc == 0)
{
ssize_t i = this->find_proc (pid);
if (i == -1) {
// oops, reaped an unmanaged process!
ACE_DEBUG ((LM_DEBUG,
"(%P|%t) oops, reaped unmanaged %d\n",
pid));
return pid;
} else
proc = process_table_[i].process_;
}
notify_proc_handler (proc->gethandle (),
pid,
*status);
this->remove_proc (pid);
}
return pid;
}
// Legacy method:
int
ACE_Process_Manager::reap (pid_t pid,
ACE_exitcode *stat_loc,
int options)
{
ACE_TRACE ("ACE_Process_Manager::reap");
return this->wait (pid,
(ACE_BIT_ENABLED (options, WNOHANG)
? ACE_Time_Value::zero
: ACE_Time_Value::max_time),
stat_loc);
}
// Notify either the process-specific handler or the generic handler.
// If process-specific, call handle_close on the handler. Returns 1
// if process found, 0 if not. Must be called with locks held.
int
ACE_Process_Manager::notify_proc_handler (ACE_HANDLE,
pid_t pid,
ACE_exitcode exit_code)
{
ssize_t i = this->find_proc (pid);
if (i != -1)
{
ACE_Process_Descriptor &proc_desc =
this->process_table_[i];
proc_desc.process_->exit_code (exit_code);
if (proc_desc.exit_notify_ != 0)
proc_desc.exit_notify_->handle_exit (proc_desc.process_);
else if (this->default_exit_handler_ != 0
&& this->default_exit_handler_->handle_exit
(proc_desc.process_) < 0) {
this->default_exit_handler_->handle_close (ACE_INVALID_HANDLE,
0);
this->default_exit_handler_ = 0;
}
}
else
ACE_DEBUG ((LM_DEBUG,
"(%P:%t|%T) ACE_Process_Manager::notify_proc_handler: unknown process %d reaped\n",
pid));
return i != -1;
}
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