Threads and Process Functions
[Apache Portability Runtime library]


Modules

 Other Child Flags

Data Structures

struct  apr_proc_t

Defines

#define APR_PROC_CHECK_EXIT(x)   (x & APR_PROC_EXIT)
#define APR_PROC_CHECK_SIGNALED(x)   (x & APR_PROC_SIGNAL)
#define APR_PROC_CHECK_CORE_DUMP(x)   (x & APR_PROC_SIGNAL_CORE)
#define APR_NO_PIPE   0
#define APR_FULL_BLOCK   1
#define APR_FULL_NONBLOCK   2
#define APR_PARENT_BLOCK   3
#define APR_CHILD_BLOCK   4
#define APR_LIMIT_CPU   0
#define APR_LIMIT_MEM   1
#define APR_LIMIT_NPROC   2
#define APR_LIMIT_NOFILE   3
#define APR_PROC_DETACH_FOREGROUND   0
#define APR_PROC_DETACH_DAEMONIZE   1

Typedefs

typedef void( apr_child_errfn_t )(apr_pool_t *proc, apr_status_t err, const char *description)
typedef apr_thread_t apr_thread_t
typedef apr_threadattr_t apr_threadattr_t
typedef apr_procattr_t apr_procattr_t
typedef apr_thread_once_t apr_thread_once_t
typedef apr_threadkey_t apr_threadkey_t
typedef apr_other_child_rec_t apr_other_child_rec_t
typedef void *(APR_THREAD_FUNC *) apr_thread_start_t (apr_thread_t *, void *)

Enumerations

enum  apr_cmdtype_e {
  APR_SHELLCMD, APR_PROGRAM, APR_PROGRAM_ENV, APR_PROGRAM_PATH,
  APR_SHELLCMD_ENV
}
enum  apr_wait_how_e { APR_WAIT, APR_NOWAIT }
enum  apr_exit_why_e { APR_PROC_EXIT = 1, APR_PROC_SIGNAL = 2, APR_PROC_SIGNAL_CORE = 4 }
enum  apr_kill_conditions_e {
  APR_KILL_NEVER, APR_KILL_ALWAYS, APR_KILL_AFTER_TIMEOUT, APR_JUST_WAIT,
  APR_KILL_ONLY_ONCE
}

Functions

apr_status_t apr_threadattr_create (apr_threadattr_t **new_attr, apr_pool_t *cont)
apr_status_t apr_threadattr_detach_set (apr_threadattr_t *attr, apr_int32_t on)
apr_status_t apr_threadattr_detach_get (apr_threadattr_t *attr)
apr_status_t apr_threadattr_stacksize_set (apr_threadattr_t *attr, apr_size_t stacksize)
apr_status_t apr_threadattr_guardsize_set (apr_threadattr_t *attr, apr_size_t guardsize)
apr_status_t apr_thread_create (apr_thread_t **new_thread, apr_threadattr_t *attr, apr_thread_start_t func, void *data, apr_pool_t *cont)
apr_status_t apr_thread_exit (apr_thread_t *thd, apr_status_t retval)
apr_status_t apr_thread_join (apr_status_t *retval, apr_thread_t *thd)
void apr_thread_yield (void)
apr_status_t apr_thread_once_init (apr_thread_once_t **control, apr_pool_t *p)
apr_status_t apr_thread_once (apr_thread_once_t *control, void(*func)(void))
apr_status_t apr_thread_detach (apr_thread_t *thd)
apr_status_t apr_thread_data_get (void **data, const char *key, apr_thread_t *thread)
apr_status_t apr_thread_data_set (void *data, const char *key, apr_status_t(*cleanup)(void *), apr_thread_t *thread)
apr_status_t apr_threadkey_private_create (apr_threadkey_t **key, void(*dest)(void *), apr_pool_t *cont)
apr_status_t apr_threadkey_private_get (void **new_mem, apr_threadkey_t *key)
apr_status_t apr_threadkey_private_set (void *priv, apr_threadkey_t *key)
apr_status_t apr_threadkey_private_delete (apr_threadkey_t *key)
apr_status_t apr_threadkey_data_get (void **data, const char *key, apr_threadkey_t *threadkey)
apr_status_t apr_threadkey_data_set (void *data, const char *key, apr_status_t(*cleanup)(void *), apr_threadkey_t *threadkey)
apr_status_t apr_procattr_create (apr_procattr_t **new_attr, apr_pool_t *cont)
apr_status_t apr_procattr_io_set (apr_procattr_t *attr, apr_int32_t in, apr_int32_t out, apr_int32_t err)
apr_status_t apr_procattr_child_in_set (struct apr_procattr_t *attr, apr_file_t *child_in, apr_file_t *parent_in)
apr_status_t apr_procattr_child_out_set (struct apr_procattr_t *attr, apr_file_t *child_out, apr_file_t *parent_out)
apr_status_t apr_procattr_child_err_set (struct apr_procattr_t *attr, apr_file_t *child_err, apr_file_t *parent_err)
apr_status_t apr_procattr_dir_set (apr_procattr_t *attr, const char *dir)
apr_status_t apr_procattr_cmdtype_set (apr_procattr_t *attr, apr_cmdtype_e cmd)
apr_status_t apr_procattr_detach_set (apr_procattr_t *attr, apr_int32_t detach)
apr_status_t apr_procattr_limit_set (apr_procattr_t *attr, apr_int32_t what, struct rlimit *limit)
apr_status_t apr_procattr_child_errfn_set (apr_procattr_t *attr, apr_child_errfn_t *errfn)
apr_status_t apr_procattr_error_check_set (apr_procattr_t *attr, apr_int32_t chk)
apr_status_t apr_procattr_addrspace_set (apr_procattr_t *attr, apr_int32_t addrspace)
apr_status_t apr_procattr_user_set (apr_procattr_t *attr, const char *username, const char *password)
apr_status_t apr_procattr_group_set (apr_procattr_t *attr, const char *groupname)
apr_status_t apr_proc_fork (apr_proc_t *proc, apr_pool_t *cont)
apr_status_t apr_proc_create (apr_proc_t *new_proc, const char *progname, const char *const *args, const char *const *env, apr_procattr_t *attr, apr_pool_t *pool)
apr_status_t apr_proc_wait (apr_proc_t *proc, int *exitcode, apr_exit_why_e *exitwhy, apr_wait_how_e waithow)
apr_status_t apr_proc_wait_all_procs (apr_proc_t *proc, int *exitcode, apr_exit_why_e *exitwhy, apr_wait_how_e waithow, apr_pool_t *p)
apr_status_t apr_proc_detach (int daemonize)
void apr_proc_other_child_register (apr_proc_t *proc, void(*maintenance)(int reason, void *, int status), void *data, apr_file_t *write_fd, apr_pool_t *p)
void apr_proc_other_child_unregister (void *data)
apr_status_t apr_proc_other_child_alert (apr_proc_t *proc, int reason, int status)
void apr_proc_other_child_refresh (apr_other_child_rec_t *ocr, int reason)
void apr_proc_other_child_refresh_all (int reason)
apr_status_t apr_proc_kill (apr_proc_t *proc, int sig)
void apr_pool_note_subprocess (apr_pool_t *a, apr_proc_t *proc, apr_kill_conditions_e how)
apr_status_t apr_setup_signal_thread (void)
apr_status_t apr_signal_thread (int(*signal_handler)(int signum))
apr_pool_tapr_thread_pool_get (const apr_thread_t *thethread)

Define Documentation

#define APR_CHILD_BLOCK   4

See also:
apr_procattr_io_set

#define APR_FULL_BLOCK   1

See also:
apr_procattr_io_set

#define APR_FULL_NONBLOCK   2

See also:
apr_procattr_io_set

#define APR_LIMIT_CPU   0

See also:
apr_procattr_limit_set

#define APR_LIMIT_MEM   1

See also:
apr_procattr_limit_set

#define APR_LIMIT_NOFILE   3

See also:
apr_procattr_limit_set

#define APR_LIMIT_NPROC   2

See also:
apr_procattr_limit_set

#define APR_NO_PIPE   0

See also:
apr_procattr_io_set

#define APR_PARENT_BLOCK   3

See also:
apr_procattr_io_set

#define APR_PROC_CHECK_CORE_DUMP (  )     (x & APR_PROC_SIGNAL_CORE)

did we get core

#define APR_PROC_CHECK_EXIT (  )     (x & APR_PROC_EXIT)

did we exit the process

#define APR_PROC_CHECK_SIGNALED (  )     (x & APR_PROC_SIGNAL)

did we get a signal

#define APR_PROC_DETACH_DAEMONIZE   1

Detach

#define APR_PROC_DETACH_FOREGROUND   0

Do not detach


Typedef Documentation

typedef void( apr_child_errfn_t)(apr_pool_t *proc, apr_status_t err, const char *description)

The prototype for APR child errfn functions. (See the description of apr_procattr_child_errfn_set() for more information.) It is passed the following parameters:

Parameters:
pool Pool associated with the apr_proc_t. If your child error function needs user data, associate it with this pool.
err APR error code describing the error
description Text description of type of processing which failed

typedef struct apr_other_child_rec_t apr_other_child_rec_t

Opaque record of child process.

typedef struct apr_procattr_t apr_procattr_t

Opaque Process attributes structure.

typedef struct apr_thread_once_t apr_thread_once_t

Opaque control variable for one-time atomic variables.

typedef void*(APR_THREAD_FUNC *) apr_thread_start_t(apr_thread_t *, void *)

The prototype for any APR thread worker functions.

typedef struct apr_thread_t apr_thread_t

Opaque Thread structure.

typedef struct apr_threadattr_t apr_threadattr_t

Opaque Thread attributes structure.

typedef struct apr_threadkey_t apr_threadkey_t

Opaque thread private address space.


Enumeration Type Documentation

enum apr_cmdtype_e

Enumerator:
APR_SHELLCMD  use the shell to invoke the program
APR_PROGRAM  invoke the program directly, no copied env
APR_PROGRAM_ENV  invoke the program, replicating our environment
APR_PROGRAM_PATH  find program on PATH, use our environment
APR_SHELLCMD_ENV  use the shell to invoke the program, replicating our environment

enum apr_exit_why_e

Enumerator:
APR_PROC_EXIT  process exited normally
APR_PROC_SIGNAL  process exited due to a signal
APR_PROC_SIGNAL_CORE  process exited and dumped a core file

enum apr_kill_conditions_e

Enumerator:
APR_KILL_NEVER  process is never sent any signals
APR_KILL_ALWAYS  process is sent SIGKILL on apr_pool_t cleanup
APR_KILL_AFTER_TIMEOUT  SIGTERM, wait 3 seconds, SIGKILL
APR_JUST_WAIT  wait forever for the process to complete
APR_KILL_ONLY_ONCE  send SIGTERM and then wait

enum apr_wait_how_e

Enumerator:
APR_WAIT  wait for the specified process to finish
APR_NOWAIT  do not wait -- just see if it has finished


Function Documentation

void apr_pool_note_subprocess ( apr_pool_t a,
apr_proc_t proc,
apr_kill_conditions_e  how 
)

Register a process to be killed when a pool dies.

Parameters:
a The pool to use to define the processes lifetime
proc The process to register
how How to kill the process, one of:
         APR_KILL_NEVER         -- process is never sent any signals
         APR_KILL_ALWAYS        -- process is sent SIGKILL on apr_pool_t cleanup
         APR_KILL_AFTER_TIMEOUT -- SIGTERM, wait 3 seconds, SIGKILL
         APR_JUST_WAIT          -- wait forever for the process to complete
         APR_KILL_ONLY_ONCE     -- send SIGTERM and then wait
 

apr_status_t apr_proc_create ( apr_proc_t new_proc,
const char *  progname,
const char *const *  args,
const char *const *  env,
apr_procattr_t attr,
apr_pool_t pool 
)

Create a new process and execute a new program within that process.

Parameters:
new_proc The resulting process handle.
progname The program to run
args the arguments to pass to the new program. The first one should be the program name.
env The new environment table for the new process. This should be a list of NULL-terminated strings. This argument is ignored for APR_PROGRAM_ENV, APR_PROGRAM_PATH, and APR_SHELLCMD_ENV types of commands.
attr the procattr we should use to determine how to create the new process
pool The pool to use.
Note:
This function returns without waiting for the new process to terminate; use apr_proc_wait for that.

apr_status_t apr_proc_detach ( int  daemonize  ) 

Detach the process from the controlling terminal.

Parameters:
daemonize set to non-zero if the process should daemonize and become a background process, else it will stay in the foreground.

apr_status_t apr_proc_fork ( apr_proc_t proc,
apr_pool_t cont 
)

This is currently the only non-portable call in APR. This executes a standard unix fork.

Parameters:
proc The resulting process handle.
cont The pool to use.
Remarks:
returns APR_INCHILD for the child, and APR_INPARENT for the parent or an error.

apr_status_t apr_proc_kill ( apr_proc_t proc,
int  sig 
)

Terminate a process.

Parameters:
proc The process to terminate.
sig How to kill the process.

apr_status_t apr_proc_other_child_alert ( apr_proc_t proc,
int  reason,
int  status 
)

Notify the maintenance callback of a registered other child process that application has detected an event, such as death.

Parameters:
proc The process to check
reason The reason code to pass to the maintenance function
status The status to pass to the maintenance function
Remarks:
An example of code using this behavior;
 rv = apr_proc_wait_all_procs(&proc, &exitcode, &status, APR_WAIT, p);
 if (APR_STATUS_IS_CHILD_DONE(rv)) {
 if APR_HAS_OTHER_CHILD
     if (apr_proc_other_child_alert(&proc, APR_OC_REASON_DEATH, status)
             == APR_SUCCESS) {
         ;  (already handled)
     }
     else
 endif
         [... handling non-otherchild processes death ...]
 

void apr_proc_other_child_refresh ( apr_other_child_rec_t ocr,
int  reason 
)

Test one specific other child processes and invoke the maintenance callback with the appropriate reason code, if still running, or the appropriate reason code if the process is no longer healthy.

Parameters:
ocr The registered other child
reason The reason code (e.g. APR_OC_REASON_RESTART) if still running

void apr_proc_other_child_refresh_all ( int  reason  ) 

Test all registered other child processes and invoke the maintenance callback with the appropriate reason code, if still running, or the appropriate reason code if the process is no longer healthy.

Parameters:
reason The reason code (e.g. APR_OC_REASON_RESTART) to running processes

void apr_proc_other_child_register ( apr_proc_t proc,
void(*)(int reason, void *, int status)  maintenance,
void *  data,
apr_file_t write_fd,
apr_pool_t p 
)

Register an other_child -- a child associated to its registered maintence callback. This callback is invoked when the process dies, is disconnected or disappears.

Parameters:
proc The child process to register.
maintenance maintenance is a function that is invoked with a reason and the data pointer passed here.
data Opaque context data passed to the maintenance function.
write_fd An fd that is probed for writing. If it is ever unwritable then the maintenance is invoked with reason OC_REASON_UNWRITABLE.
p The pool to use for allocating memory.
Bug:
write_fd duplicates the proc->out stream, it's really redundant and should be replaced in the APR 1.0 API with a bitflag of which proc->in/out/err handles should be health checked.

no platform currently tests the pipes health.

void apr_proc_other_child_unregister ( void *  data  ) 

Stop watching the specified other child.

Parameters:
data The data to pass to the maintenance function. This is used to find the process to unregister.
Warning:
Since this can be called by a maintenance function while we're scanning the other_children list, all scanners should protect themself by loading ocr->next before calling any maintenance function.

apr_status_t apr_proc_wait ( apr_proc_t proc,
int *  exitcode,
apr_exit_why_e exitwhy,
apr_wait_how_e  waithow 
)

Wait for a child process to die

Parameters:
proc The process handle that corresponds to the desired child process
exitcode The returned exit status of the child, if a child process dies, or the signal that caused the child to die. On platforms that don't support obtaining this information, the status parameter will be returned as APR_ENOTIMPL.
exitwhy Why the child died, the bitwise or of:
            APR_PROC_EXIT         -- process terminated normally
            APR_PROC_SIGNAL       -- process was killed by a signal
            APR_PROC_SIGNAL_CORE  -- process was killed by a signal, and
                                     generated a core dump.
 
waithow How should we wait. One of:
            APR_WAIT   -- block until the child process dies.
            APR_NOWAIT -- return immediately regardless of if the 
                          child is dead or not.
 
Remarks:
The childs status is in the return code to this process. It is one of:
            APR_CHILD_DONE     -- child is no longer running.
            APR_CHILD_NOTDONE  -- child is still running.
 

apr_status_t apr_proc_wait_all_procs ( apr_proc_t proc,
int *  exitcode,
apr_exit_why_e exitwhy,
apr_wait_how_e  waithow,
apr_pool_t p 
)

Wait for any current child process to die and return information about that child.

Parameters:
proc Pointer to NULL on entry, will be filled out with child's information
exitcode The returned exit status of the child, if a child process dies, or the signal that caused the child to die. On platforms that don't support obtaining this information, the status parameter will be returned as APR_ENOTIMPL.
exitwhy Why the child died, the bitwise or of:
            APR_PROC_EXIT         -- process terminated normally
            APR_PROC_SIGNAL       -- process was killed by a signal
            APR_PROC_SIGNAL_CORE  -- process was killed by a signal, and
                                     generated a core dump.
 
waithow How should we wait. One of:
            APR_WAIT   -- block until the child process dies.
            APR_NOWAIT -- return immediately regardless of if the 
                          child is dead or not.
 
p Pool to allocate child information out of.
Bug:
Passing proc as a *proc rather than **proc was an odd choice for some platforms... this should be revisited in 1.0

apr_status_t apr_procattr_addrspace_set ( apr_procattr_t attr,
apr_int32_t  addrspace 
)

Determine if the child should start in its own address space or using the current one from its parent

Parameters:
attr The procattr we care about.
addrspace Should the child start in its own address space? Default is no on NetWare and yes on other platforms.

apr_status_t apr_procattr_child_err_set ( struct apr_procattr_t attr,
apr_file_t child_err,
apr_file_t parent_err 
)

Set the child_err and parent_err values to existing apr_file_t values.

Parameters:
attr The procattr we care about.
child_err apr_file_t value to use as child_err. Must be a valid file.
parent_err apr_file_t value to use as parent_err. Must be a valid file.
Remarks:
This is NOT a required initializer function. This is useful if you have already opened a pipe (or multiple files) that you wish to use, perhaps persistently across multiple process invocations - such as a log file.

apr_status_t apr_procattr_child_errfn_set ( apr_procattr_t attr,
apr_child_errfn_t errfn 
)

Specify an error function to be called in the child process if APR encounters an error in the child prior to running the specified program.

Parameters:
attr The procattr describing the child process to be created.
errfn The function to call in the child process.
Remarks:
At the present time, it will only be called from apr_proc_create() on platforms where fork() is used. It will never be called on other platforms, on those platforms apr_proc_create() will return the error in the parent process rather than invoke the callback in the now-forked child process.

apr_status_t apr_procattr_child_in_set ( struct apr_procattr_t attr,
apr_file_t child_in,
apr_file_t parent_in 
)

Set the child_in and/or parent_in values to existing apr_file_t values.

Parameters:
attr The procattr we care about.
child_in apr_file_t value to use as child_in. Must be a valid file.
parent_in apr_file_t value to use as parent_in. Must be a valid file.
Remarks:
This is NOT a required initializer function. This is useful if you have already opened a pipe (or multiple files) that you wish to use, perhaps persistently across multiple process invocations - such as a log file. You can save some extra function calls by not creating your own pipe since this creates one in the process space for you.

apr_status_t apr_procattr_child_out_set ( struct apr_procattr_t attr,
apr_file_t child_out,
apr_file_t parent_out 
)

Set the child_out and parent_out values to existing apr_file_t values.

Parameters:
attr The procattr we care about.
child_out apr_file_t value to use as child_out. Must be a valid file.
parent_out apr_file_t value to use as parent_out. Must be a valid file.
Remarks:
This is NOT a required initializer function. This is useful if you have already opened a pipe (or multiple files) that you wish to use, perhaps persistently across multiple process invocations - such as a log file.

apr_status_t apr_procattr_cmdtype_set ( apr_procattr_t attr,
apr_cmdtype_e  cmd 
)

Set what type of command the child process will call.

Parameters:
attr The procattr we care about.
cmd The type of command. One of:
            APR_SHELLCMD     --  Anything that the shell can handle
            APR_PROGRAM      --  Executable program   (default) 
            APR_PROGRAM_ENV  --  Executable program, copy environment
            APR_PROGRAM_PATH --  Executable program on PATH, copy env
 

apr_status_t apr_procattr_create ( apr_procattr_t **  new_attr,
apr_pool_t cont 
)

Create and initialize a new procattr variable

Parameters:
new_attr The newly created procattr.
cont The pool to use

apr_status_t apr_procattr_detach_set ( apr_procattr_t attr,
apr_int32_t  detach 
)

Determine if the child should start in detached state.

Parameters:
attr The procattr we care about.
detach Should the child start in detached state? Default is no.

apr_status_t apr_procattr_dir_set ( apr_procattr_t attr,
const char *  dir 
)

Set which directory the child process should start executing in.

Parameters:
attr The procattr we care about.
dir Which dir to start in. By default, this is the same dir as the parent currently resides in, when the createprocess call is made.

apr_status_t apr_procattr_error_check_set ( apr_procattr_t attr,
apr_int32_t  chk 
)

Specify that apr_proc_create() should do whatever it can to report failures to the caller of apr_proc_create(), rather than find out in the child.

Parameters:
attr The procattr describing the child process to be created.
chk Flag to indicate whether or not extra work should be done to try to report failures to the caller.
Remarks:
This flag only affects apr_proc_create() on platforms where fork() is used. This leads to extra overhead in the calling process, but that may help the application handle such errors more gracefully.

apr_status_t apr_procattr_group_set ( apr_procattr_t attr,
const char *  groupname 
)

Set the group used for running process

Parameters:
attr The procattr we care about.
groupname The group name used

apr_status_t apr_procattr_io_set ( apr_procattr_t attr,
apr_int32_t  in,
apr_int32_t  out,
apr_int32_t  err 
)

Determine if any of stdin, stdout, or stderr should be linked to pipes when starting a child process.

Parameters:
attr The procattr we care about.
in Should stdin be a pipe back to the parent?
out Should stdout be a pipe back to the parent?
err Should stderr be a pipe back to the parent?

apr_status_t apr_procattr_limit_set ( apr_procattr_t attr,
apr_int32_t  what,
struct rlimit *  limit 
)

Set the Resource Utilization limits when starting a new process.

Parameters:
attr The procattr we care about.
what Which limit to set, one of:
                 APR_LIMIT_CPU
                 APR_LIMIT_MEM
                 APR_LIMIT_NPROC
                 APR_LIMIT_NOFILE
 
limit Value to set the limit to.

apr_status_t apr_procattr_user_set ( apr_procattr_t attr,
const char *  username,
const char *  password 
)

Set the username used for running process

Parameters:
attr The procattr we care about.
username The username used
password User password if needed. Password is needed on WIN32 or any other platform having APR_PROCATTR_USER_SET_REQUIRES_PASSWORD set.

apr_status_t apr_setup_signal_thread ( void   ) 

Setup the process for a single thread to be used for all signal handling.

Warning:
This must be called before any threads are created

apr_status_t apr_signal_thread ( int(*)(int signum)  signal_handler  ) 

Make the current thread listen for signals. This thread will loop forever, calling a provided function whenever it receives a signal. That functions should return 1 if the signal has been handled, 0 otherwise.

Parameters:
signal_handler The function to call when a signal is received apr_status_t apr_signal_thread((int)(*signal_handler)(int signum))

apr_status_t apr_thread_create ( apr_thread_t **  new_thread,
apr_threadattr_t attr,
apr_thread_start_t  func,
void *  data,
apr_pool_t cont 
)

Create a new thread of execution

Parameters:
new_thread The newly created thread handle.
attr The threadattr to use to determine how to create the thread
func The function to start the new thread in
data Any data to be passed to the starting function
cont The pool to use

apr_status_t apr_thread_data_get ( void **  data,
const char *  key,
apr_thread_t thread 
)

Return the pool associated with the current thread.

Parameters:
data The user data associated with the thread.
key The key to associate with the data
thread The currently open thread.

apr_status_t apr_thread_data_set ( void *  data,
const char *  key,
apr_status_t(*)(void *)  cleanup,
apr_thread_t thread 
)

Return the pool associated with the current thread.

Parameters:
data The user data to associate with the thread.
key The key to use for associating the data with the thread
cleanup The cleanup routine to use when the thread is destroyed.
thread The currently open thread.

apr_status_t apr_thread_detach ( apr_thread_t thd  ) 

detach a thread

Parameters:
thd The thread to detach

apr_status_t apr_thread_exit ( apr_thread_t thd,
apr_status_t  retval 
)

stop the current thread

Parameters:
thd The thread to stop
retval The return value to pass back to any thread that cares

apr_status_t apr_thread_join ( apr_status_t retval,
apr_thread_t thd 
)

block until the desired thread stops executing.

Parameters:
retval The return value from the dead thread.
thd The thread to join

apr_status_t apr_thread_once ( apr_thread_once_t control,
void(*)(void)  func 
)

Run the specified function one time, regardless of how many threads call it.

Parameters:
control The control variable. The same variable should be passed in each time the function is tried to be called. This is how the underlying functions determine if the function has ever been called before.
func The function to call.

apr_status_t apr_thread_once_init ( apr_thread_once_t **  control,
apr_pool_t p 
)

Initialize the control variable for apr_thread_once. If this isn't called, apr_initialize won't work.

Parameters:
control The control variable to initialize
p The pool to allocate data from.

apr_pool_t* apr_thread_pool_get ( const apr_thread_t thethread  ) 

Get the child-pool used by the thread from the thread info.

Returns:
apr_pool_t the pool

void apr_thread_yield ( void   ) 

force the current thread to yield the processor

apr_status_t apr_threadattr_create ( apr_threadattr_t **  new_attr,
apr_pool_t cont 
)

Create and initialize a new threadattr variable

Parameters:
new_attr The newly created threadattr.
cont The pool to use

apr_status_t apr_threadattr_detach_get ( apr_threadattr_t attr  ) 

Get the detach state for this threadattr.

Parameters:
attr The threadattr to reference
Returns:
APR_DETACH if threads are to be detached, or APR_NOTDETACH if threads are to be joinable.

apr_status_t apr_threadattr_detach_set ( apr_threadattr_t attr,
apr_int32_t  on 
)

Set if newly created threads should be created in detached state.

Parameters:
attr The threadattr to affect
on Non-zero if detached threads should be created.

apr_status_t apr_threadattr_guardsize_set ( apr_threadattr_t attr,
apr_size_t  guardsize 
)

Set the stack guard area size of newly created threads.

Parameters:
attr The threadattr to affect
guardsize The stack guard area size in bytes
Note:
Thread library implementations commonly use a "guard area" after each thread's stack which is not readable or writable such that stack overflows cause a segfault; this consumes e.g. 4K of memory and increases memory management overhead. Setting the guard area size to zero hence trades off reliable behaviour on stack overflow for performance.

apr_status_t apr_threadattr_stacksize_set ( apr_threadattr_t attr,
apr_size_t  stacksize 
)

Set the stack size of newly created threads.

Parameters:
attr The threadattr to affect
stacksize The stack size in bytes

apr_status_t apr_threadkey_data_get ( void **  data,
const char *  key,
apr_threadkey_t threadkey 
)

Return the pool associated with the current threadkey.

Parameters:
data The user data associated with the threadkey.
key The key associated with the data
threadkey The currently open threadkey.

apr_status_t apr_threadkey_data_set ( void *  data,
const char *  key,
apr_status_t(*)(void *)  cleanup,
apr_threadkey_t threadkey 
)

Return the pool associated with the current threadkey.

Parameters:
data The data to set.
key The key to associate with the data.
cleanup The cleanup routine to use when the file is destroyed.
threadkey The currently open threadkey.

apr_status_t apr_threadkey_private_create ( apr_threadkey_t **  key,
void(*)(void *)  dest,
apr_pool_t cont 
)

Create and initialize a new thread private address space

Parameters:
key The thread private handle.
dest The destructor to use when freeing the private memory.
cont The pool to use

apr_status_t apr_threadkey_private_delete ( apr_threadkey_t key  ) 

Free the thread private memory

Parameters:
key The handle for the desired thread private memory

apr_status_t apr_threadkey_private_get ( void **  new_mem,
apr_threadkey_t key 
)

Get a pointer to the thread private memory

Parameters:
new_mem The data stored in private memory
key The handle for the desired thread private memory

apr_status_t apr_threadkey_private_set ( void *  priv,
apr_threadkey_t key 
)

Set the data to be stored in thread private memory

Parameters:
priv The data to be stored in private memory
key The handle for the desired thread private memory


Generated on Mon Nov 26 11:23:53 2007 for Apache Portable Runtime by  doxygen 1.5.2