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[cleanup] Remove long-obsolete gpxe/async.h header file
This commit is contained in:
Michael Brown
parent
ac28d054c8
commit
31c6df5365
@ -11,7 +11,6 @@
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#include <gpxe/list.h>
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#include <gpxe/if_ether.h>
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#include <gpxe/retry.h>
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#include <gpxe/async.h>
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#include <gpxe/ata.h>
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/** An AoE ATA command */
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@ -1,228 +0,0 @@
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#ifndef _GPXE_ASYNC_H
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#define _GPXE_ASYNC_H
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/** @file
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*
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* Asynchronous operations
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*
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*/
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#include <gpxe/list.h>
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struct async;
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/** An asynchronous operation ID
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*
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* Only positive identifiers are valid; negative values are used to
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* indicate errors.
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*/
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typedef long aid_t;
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/** Signals that can be delivered to asynchronous operations */
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enum signal {
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/** A child asynchronous operation has completed
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*
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* The parent should call async_wait() to reap the completed
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* child. async_wait() will return the exit status and
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* operation identifier of the child.
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*
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* The handler for this signal can be set to @c NULL; if it
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* is, then the children will accumulate as zombies until
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* async_wait() is called.
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*
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* The handler for this signal can also be set to @c SIG_IGN;
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* if it is, then the children will automatically be reaped.
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* Note that if you use @c SIG_IGN then you will not be able
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* to retrieve the return status of the children; the call to
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* async_wait() will simply return -ECHILD.
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*/
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SIGCHLD = 0,
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/** Cancel asynchronous operation
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*
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* This signal should trigger the asynchronous operation to
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* cancel itself (including killing all its own children, if
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* any), and then call async_done(). The asynchronous
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* operation is allowed to not complete immediately.
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*
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* The handler for this signal can be set to @c NULL; if it
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* is, then attempts to cancel the asynchronous operation will
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* fail and the operation will complete normally. Anything
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* waiting for the operation to cancel will block.
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*/
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SIGKILL,
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/** Update progress of asynchronous operation
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*
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* This signal should cause the asynchronous operation to
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* immediately update the @c completed and @c total fields.
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*
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* The handler for this signal can be set to @c NULL; if it
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* is, then the asynchronous operation is expected to keep its
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* @c completed and @c total fields up to date at all times.
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*/
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SIGUPDATE,
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SIGMAX
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};
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/**
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* A signal handler
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*
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* @v async Asynchronous operation
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* @v signal Signal received
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*/
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typedef void ( * signal_handler_t ) ( struct async *async,
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enum signal signal );
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/** Asynchronous operation operations */
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struct async_operations {
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/** Reap asynchronous operation
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*
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* @v async Asynchronous operation
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*
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* Release all resources associated with the asynchronous
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* operation. This will be called only after the asynchronous
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* operation itself calls async_done(), so the only remaining
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* resources will probably be the memory used by the struct
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* async itself.
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*
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* This method can be set to @c NULL; if it is, then no
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* resources will be freed. This may be suitable for
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* asynchronous operations that consume no dynamically
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* allocated memory.
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*/
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void ( * reap ) ( struct async *async );
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/** Handle signals */
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signal_handler_t signal[SIGMAX];
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};
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/** An asynchronous operation */
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struct async {
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/** Other asynchronous operations with the same parent */
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struct list_head siblings;
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/** Child asynchronous operations */
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struct list_head children;
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/** Parent asynchronous operation
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*
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* This field is optional; if left to NULL then the owner must
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* never call async_done().
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*/
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struct async *parent;
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/** Asynchronous operation ID */
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aid_t aid;
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/** Final return status code */
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int rc;
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/** Amount of operation completed so far
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*
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* The units for this quantity are arbitrary. @c completed
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* divded by @total should give something which approximately
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* represents the progress through the operation. For a
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* download operation, using byte counts would make sense.
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*
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* This progress indicator should also incorporate the status
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* of any child asynchronous operations.
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*/
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unsigned long completed;
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/** Total operation size
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*
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* See @c completed. A zero value means "total size unknown"
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* and is explcitly permitted; users should take this into
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* account before calculating @c completed/total.
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*/
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unsigned long total;
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struct async_operations *aop;
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};
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extern struct async_operations default_async_operations;
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extern struct async_operations orphan_async_operations;
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extern aid_t async_init ( struct async *async, struct async_operations *aop,
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struct async *parent );
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extern void async_uninit ( struct async *async );
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extern void async_ignore_signal ( struct async *async, enum signal signal );
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extern void async_signal ( struct async *async, enum signal signal );
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extern void async_signal_children ( struct async *async, enum signal signal );
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extern void async_done ( struct async *async, int rc );
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extern aid_t async_wait ( struct async *async, int *rc, int block );
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/** Default signal handler */
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#define SIG_DFL NULL
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/** Ignore signal */
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#define SIG_IGN async_ignore_signal
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/**
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* Initialise orphan asynchronous operation
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*
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* @v async Asynchronous operation
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* @ret aid Asynchronous operation ID
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*
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* An orphan asynchronous operation can act as a context for child
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* operations. However, you must not call async_done() on such an
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* operation, since this would attempt to send a signal to its
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* (non-existent) parent. Instead, simply free the structure (after
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* calling async_wait() to ensure that any child operations have
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* completed).
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*/
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static inline aid_t async_init_orphan ( struct async *async ) {
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return async_init ( async, &orphan_async_operations, NULL );
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}
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/**
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* Execute and block on an asynchronous operation
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*
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* @v async_temp Temporary asynchronous operation structure to use
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* @v START Code used to start the asynchronous operation
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* @ret rc Return status code
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*
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* This is a notational shorthand for writing
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*
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* async_init_orphan ( &async_temp );
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* if ( ( rc = START ) == 0 )
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* async_wait ( &async_temp );
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* if ( rc != 0 ) {
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* ...handle failure...
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* }
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*
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* and allows you instead to write
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*
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* if ( ( rc = async_block ( &async_temp, START ) ) != 0 ) {
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* ...handle failure...
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* }
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*
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* The argument START is a code snippet; it should initiate an
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* asynchronous operation as a child of @c async_temp and return an
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* error status code if it failed to do so (e.g. due to malloc()
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* failure).
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*/
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#define async_block( async_temp, START ) ( { \
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int rc; \
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\
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async_init_orphan ( async_temp ); \
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if ( ( rc = START ) == 0 ) \
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async_wait ( async_temp, &rc, 1 ); \
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rc; \
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} )
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/**
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* Execute and block on an asynchronous operation, with progress indicator
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*
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* @v async_temp Temporary asynchronous operation structure to use
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* @v START Code used to start the asynchronous operation
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* @ret rc Return status code
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*
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* As for async_block(), the argument START is a code snippet; it
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* should initiate an asynchronous operation as a child of @c
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* async_temp and return an error status code if it failed to do so
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* (e.g. due to malloc() failure).
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*/
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#define async_block_progress( async_temp, START ) ( { \
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int rc; \
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\
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async_init_orphan ( async_temp ); \
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if ( ( rc = START ) == 0 ) \
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async_wait_progress ( async_temp, &rc );\
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rc; \
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} )
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#endif /* _GPXE_ASYNC_H */
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