X-Git-Url: https://git.saurik.com/apple/xnu.git/blobdiff_plain/91447636331957f3d9b5ca5b508f07c526b0074d..7ee9d059c4eecf68ae4f8b0fb99ae2471eda79af:/bsd/sys/aio_kern.h?ds=inline

diff --git a/bsd/sys/aio_kern.h b/bsd/sys/aio_kern.h
index 09401f0b3..18a801f98 100644
--- a/bsd/sys/aio_kern.h
+++ b/bsd/sys/aio_kern.h
@@ -1,23 +1,29 @@
 /*
  * Copyright (c) 2003 Apple Computer, Inc. All rights reserved.
  *
- * @APPLE_LICENSE_HEADER_START@
+ * @APPLE_OSREFERENCE_LICENSE_HEADER_START@
  * 
- * The contents of this file constitute Original Code as defined in and
- * are subject to the Apple Public Source License Version 1.1 (the
- * "License").  You may not use this file except in compliance with the
- * License.  Please obtain a copy of the License at
- * http://www.apple.com/publicsource and read it before using this file.
+ * This file contains Original Code and/or Modifications of Original Code
+ * as defined in and that are subject to the Apple Public Source License
+ * Version 2.0 (the 'License'). You may not use this file except in
+ * compliance with the License. The rights granted to you under the License
+ * may not be used to create, or enable the creation or redistribution of,
+ * unlawful or unlicensed copies of an Apple operating system, or to
+ * circumvent, violate, or enable the circumvention or violation of, any
+ * terms of an Apple operating system software license agreement.
  * 
- * This Original Code and all software distributed under the License are
- * distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY KIND, EITHER
+ * Please obtain a copy of the License at
+ * http://www.opensource.apple.com/apsl/ and read it before using this file.
+ * 
+ * The Original Code and all software distributed under the License are
+ * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
  * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
  * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
- * FITNESS FOR A PARTICULAR PURPOSE OR NON-INFRINGEMENT.  Please see the
- * License for the specific language governing rights and limitations
- * under the License.
+ * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
+ * Please see the License for the specific language governing rights and
+ * limitations under the License.
  * 
- * @APPLE_LICENSE_HEADER_END@
+ * @APPLE_OSREFERENCE_LICENSE_HEADER_END@
  */
 /* 
  *	File:	sys/aio_kern.h
@@ -36,35 +42,46 @@
 
 struct aio_workq_entry
 {
-	TAILQ_ENTRY( aio_workq_entry )	aio_workq_link;
-	struct proc						*procp;		/* user proc that queued this request */
-	user_addr_t						uaiocbp;  	/* pointer passed in from user land */
-	user_addr_t						fsyncp;		/* not NULL means this request must complete */
-												/* before an aio_fsync call can proceed. */
-	vm_map_t						aio_map;	/* user land map we have a reference to */
-	user_ssize_t					returnval;	/* return value from read / write request */	
-	int								errorval;	/* error value from read / write request */
-	int								flags;		
-	long							group_tag;	/* identifier used to group IO requests */
-	struct user_aiocb				aiocb;		/* copy of aiocb from user land */
+	TAILQ_ENTRY( aio_workq_entry )	aio_workq_link; /* Protected by queue lock */
+	TAILQ_ENTRY( aio_workq_entry )  aio_proc_link;  /* Proteced by proc's aio lock */
+
+	/* Proc lock */
+	void		*group_tag;	/* identifier used to group IO requests */
+
+	/* Initialized and never changed, safe to access */
+	struct proc	*procp;		/* user proc that queued this request */
+	user_addr_t	uaiocbp;  	/* pointer passed in from user land */
+	struct user_aiocb	aiocb;	/* copy of aiocb from user land */
+	vm_map_t	aio_map;	/* user land map we have a reference to */
+
+	/* Entry lock */
+	int		aio_refcount;
+	user_ssize_t	returnval;	/* return value from read / write request */	
+	int		errorval;	/* error value from read / write request */
+	int		flags;		
 };
 typedef struct aio_workq_entry aio_workq_entry;
 
 /*
  * definitions for aio_workq_entry.flags
  */
-#define	AIO_READ		0x00000001	
-#define	AIO_WRITE		0x00000002
+#define	AIO_READ		0x00000001	/* a read */
+#define	AIO_WRITE		0x00000002	/* a write */
 #define	AIO_FSYNC		0x00000004	/* aio_fsync with op = O_SYNC */
 #define	AIO_DSYNC		0x00000008	/* aio_fsync with op = O_DSYNC (not supported yet) */
 #define	AIO_LIO			0x00000010	/* lio_listio generated IO */
-#define	AIO_DO_FREE		0x00000800	/* entry needs to be freed */
-#define	AIO_COMPLETION	0x00001000	/* entry is in completion processing (not freeable yet) */
+#define	AIO_DO_FREE		0x00000800	/* entry should be freed when last reference is dropped. */
+						/* 	set by aio_return() and _aio_exit() */
 #define	AIO_DISABLE		0x00002000	/* process is trying to exit or exec and we need */
-									/* 	to disable normal completion notification */
-#define	AIO_WAITING		0x00004000	/* process is trying to exit, exec, or close and is */
-									/* 	waiting for one or more active IO requests to */
-									/*	complete */
+						/* 	to not try to send a signal from do_aio_completion() */
+#define	AIO_CLOSE_WAIT		0x00004000	/* process is trying to close and is */
+						/* 	waiting for one or more active IO requests to */
+						/*	complete */
+#define AIO_EXIT_WAIT		0x00008000	/* process is trying to exit or exec and is */
+						/* 	waiting for one or more active IO requests to */
+						/*	complete */
+
+#define AIO_LIO_NOTIFY		0x00010000	/* wait for list complete */
 
 /*
  * Prototypes
@@ -83,7 +100,7 @@ __private_extern__ void
 _aio_create_worker_threads(int num);
 
 __private_extern__ void		
-aio_init(void);
+aio_init(void) __attribute__((section("__TEXT, initcode")));
 
 task_t						
 get_aiotask(void);