[cleanup] Remove long-obsolete gpxe/async.h header file

src/include/gpxe/aoe.h

@@ -11,7 +11,6 @@
 #include <gpxe/list.h>
 #include <gpxe/if_ether.h>
 #include <gpxe/retry.h>
-#include <gpxe/async.h>
 #include <gpxe/ata.h>
 
 /** An AoE ATA command */

src/include/gpxe/async.h

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