author | William Roberts <williamr@symbian.org> |
Mon, 21 Dec 2009 16:50:18 +0000 | |
changeset 31 | a9d6d2890663 |
parent 1 | 2fb8b9db1c86 |
permissions | -rw-r--r-- |
1
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Initial QEMU (symbian-qemu-0.9.1-12) import
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parents:
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1 |
/* |
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Initial QEMU (symbian-qemu-0.9.1-12) import
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parents:
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2 |
* QEMU aio implementation |
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Initial QEMU (symbian-qemu-0.9.1-12) import
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3 |
* |
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Initial QEMU (symbian-qemu-0.9.1-12) import
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4 |
* Copyright IBM, Corp. 2008 |
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Initial QEMU (symbian-qemu-0.9.1-12) import
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5 |
* |
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Initial QEMU (symbian-qemu-0.9.1-12) import
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6 |
* Authors: |
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Initial QEMU (symbian-qemu-0.9.1-12) import
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7 |
* Anthony Liguori <aliguori@us.ibm.com> |
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Initial QEMU (symbian-qemu-0.9.1-12) import
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8 |
* |
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Initial QEMU (symbian-qemu-0.9.1-12) import
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9 |
* This work is licensed under the terms of the GNU GPL, version 2. See |
2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import
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* the COPYING file in the top-level directory. |
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Initial QEMU (symbian-qemu-0.9.1-12) import
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parents:
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* |
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Initial QEMU (symbian-qemu-0.9.1-12) import
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parents:
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12 |
*/ |
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Initial QEMU (symbian-qemu-0.9.1-12) import
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parents:
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13 |
|
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Initial QEMU (symbian-qemu-0.9.1-12) import
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#include "qemu-common.h" |
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15 |
#include "block.h" |
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Initial QEMU (symbian-qemu-0.9.1-12) import
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16 |
#include "sys-queue.h" |
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Initial QEMU (symbian-qemu-0.9.1-12) import
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17 |
#include "qemu_socket.h" |
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Initial QEMU (symbian-qemu-0.9.1-12) import
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18 |
|
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Initial QEMU (symbian-qemu-0.9.1-12) import
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typedef struct AioHandler AioHandler; |
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20 |
|
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/* The list of registered AIO handlers */ |
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static LIST_HEAD(, AioHandler) aio_handlers; |
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Initial QEMU (symbian-qemu-0.9.1-12) import
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|
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Initial QEMU (symbian-qemu-0.9.1-12) import
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/* This is a simple lock used to protect the aio_handlers list. Specifically, |
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Initial QEMU (symbian-qemu-0.9.1-12) import
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* it's used to ensure that no callbacks are removed while we're walking and |
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Initial QEMU (symbian-qemu-0.9.1-12) import
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* dispatching callbacks. |
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Initial QEMU (symbian-qemu-0.9.1-12) import
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*/ |
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static int walking_handlers; |
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|
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struct AioHandler |
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{ |
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int fd; |
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IOHandler *io_read; |
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IOHandler *io_write; |
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AioFlushHandler *io_flush; |
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int deleted; |
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void *opaque; |
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LIST_ENTRY(AioHandler) node; |
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Initial QEMU (symbian-qemu-0.9.1-12) import
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}; |
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|
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static AioHandler *find_aio_handler(int fd) |
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{ |
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AioHandler *node; |
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44 |
|
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LIST_FOREACH(node, &aio_handlers, node) { |
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Initial QEMU (symbian-qemu-0.9.1-12) import
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if (node->fd == fd) |
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Initial QEMU (symbian-qemu-0.9.1-12) import
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return node; |
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48 |
} |
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|
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return NULL; |
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} |
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52 |
|
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int qemu_aio_set_fd_handler(int fd, |
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IOHandler *io_read, |
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IOHandler *io_write, |
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AioFlushHandler *io_flush, |
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void *opaque) |
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{ |
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AioHandler *node; |
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60 |
|
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61 |
node = find_aio_handler(fd); |
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62 |
|
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/* Are we deleting the fd handler? */ |
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if (!io_read && !io_write) { |
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Initial QEMU (symbian-qemu-0.9.1-12) import
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if (node) { |
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/* If the lock is held, just mark the node as deleted */ |
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if (walking_handlers) |
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68 |
node->deleted = 1; |
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69 |
else { |
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/* Otherwise, delete it for real. We can't just mark it as |
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* deleted because deleted nodes are only cleaned up after |
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* releasing the walking_handlers lock. |
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73 |
*/ |
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74 |
LIST_REMOVE(node, node); |
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75 |
qemu_free(node); |
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76 |
} |
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77 |
} |
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78 |
} else { |
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79 |
if (node == NULL) { |
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Initial QEMU (symbian-qemu-0.9.1-12) import
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parents:
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80 |
/* Alloc and insert if it's not already there */ |
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Initial QEMU (symbian-qemu-0.9.1-12) import
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parents:
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81 |
node = qemu_mallocz(sizeof(AioHandler)); |
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Initial QEMU (symbian-qemu-0.9.1-12) import
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parents:
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82 |
if (node == NULL) |
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Initial QEMU (symbian-qemu-0.9.1-12) import
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parents:
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83 |
return -ENOMEM; |
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Initial QEMU (symbian-qemu-0.9.1-12) import
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84 |
node->fd = fd; |
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Initial QEMU (symbian-qemu-0.9.1-12) import
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parents:
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85 |
LIST_INSERT_HEAD(&aio_handlers, node, node); |
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Initial QEMU (symbian-qemu-0.9.1-12) import
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parents:
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86 |
} |
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Initial QEMU (symbian-qemu-0.9.1-12) import
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parents:
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87 |
/* Update handler with latest information */ |
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Initial QEMU (symbian-qemu-0.9.1-12) import
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parents:
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88 |
node->io_read = io_read; |
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Initial QEMU (symbian-qemu-0.9.1-12) import
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parents:
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89 |
node->io_write = io_write; |
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Initial QEMU (symbian-qemu-0.9.1-12) import
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parents:
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90 |
node->io_flush = io_flush; |
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Initial QEMU (symbian-qemu-0.9.1-12) import
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parents:
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91 |
node->opaque = opaque; |
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Initial QEMU (symbian-qemu-0.9.1-12) import
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parents:
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92 |
} |
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Initial QEMU (symbian-qemu-0.9.1-12) import
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parents:
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93 |
|
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Initial QEMU (symbian-qemu-0.9.1-12) import
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parents:
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94 |
qemu_set_fd_handler2(fd, NULL, io_read, io_write, opaque); |
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Initial QEMU (symbian-qemu-0.9.1-12) import
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parents:
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95 |
|
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Initial QEMU (symbian-qemu-0.9.1-12) import
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parents:
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96 |
return 0; |
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Initial QEMU (symbian-qemu-0.9.1-12) import
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parents:
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97 |
} |
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Initial QEMU (symbian-qemu-0.9.1-12) import
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parents:
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98 |
|
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Initial QEMU (symbian-qemu-0.9.1-12) import
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parents:
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99 |
void qemu_aio_flush(void) |
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Initial QEMU (symbian-qemu-0.9.1-12) import
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parents:
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100 |
{ |
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Initial QEMU (symbian-qemu-0.9.1-12) import
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parents:
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101 |
AioHandler *node; |
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Initial QEMU (symbian-qemu-0.9.1-12) import
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parents:
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102 |
int ret; |
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Initial QEMU (symbian-qemu-0.9.1-12) import
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parents:
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103 |
|
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Initial QEMU (symbian-qemu-0.9.1-12) import
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parents:
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104 |
do { |
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Initial QEMU (symbian-qemu-0.9.1-12) import
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parents:
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105 |
ret = 0; |
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Initial QEMU (symbian-qemu-0.9.1-12) import
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parents:
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106 |
|
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Initial QEMU (symbian-qemu-0.9.1-12) import
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parents:
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107 |
LIST_FOREACH(node, &aio_handlers, node) { |
2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import
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parents:
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108 |
ret |= node->io_flush(node->opaque); |
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Initial QEMU (symbian-qemu-0.9.1-12) import
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parents:
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109 |
} |
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Initial QEMU (symbian-qemu-0.9.1-12) import
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parents:
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110 |
|
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Initial QEMU (symbian-qemu-0.9.1-12) import
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|
111 |
qemu_aio_wait(); |
2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import
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parents:
diff
changeset
|
112 |
} while (ret > 0); |
2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import
martin.trojer@nokia.com
parents:
diff
changeset
|
113 |
} |
2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import
martin.trojer@nokia.com
parents:
diff
changeset
|
114 |
|
2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import
martin.trojer@nokia.com
parents:
diff
changeset
|
115 |
void qemu_aio_wait(void) |
2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import
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parents:
diff
changeset
|
116 |
{ |
2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import
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parents:
diff
changeset
|
117 |
int ret; |
2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import
martin.trojer@nokia.com
parents:
diff
changeset
|
118 |
|
2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import
martin.trojer@nokia.com
parents:
diff
changeset
|
119 |
if (qemu_bh_poll()) |
2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import
martin.trojer@nokia.com
parents:
diff
changeset
|
120 |
return; |
2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import
martin.trojer@nokia.com
parents:
diff
changeset
|
121 |
|
2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import
martin.trojer@nokia.com
parents:
diff
changeset
|
122 |
do { |
2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import
martin.trojer@nokia.com
parents:
diff
changeset
|
123 |
AioHandler *node; |
2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import
martin.trojer@nokia.com
parents:
diff
changeset
|
124 |
fd_set rdfds, wrfds; |
2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import
martin.trojer@nokia.com
parents:
diff
changeset
|
125 |
int max_fd = -1; |
2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import
martin.trojer@nokia.com
parents:
diff
changeset
|
126 |
|
2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import
martin.trojer@nokia.com
parents:
diff
changeset
|
127 |
walking_handlers = 1; |
2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import
martin.trojer@nokia.com
parents:
diff
changeset
|
128 |
|
2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import
martin.trojer@nokia.com
parents:
diff
changeset
|
129 |
FD_ZERO(&rdfds); |
2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import
martin.trojer@nokia.com
parents:
diff
changeset
|
130 |
FD_ZERO(&wrfds); |
2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import
martin.trojer@nokia.com
parents:
diff
changeset
|
131 |
|
2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import
martin.trojer@nokia.com
parents:
diff
changeset
|
132 |
/* fill fd sets */ |
2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import
martin.trojer@nokia.com
parents:
diff
changeset
|
133 |
LIST_FOREACH(node, &aio_handlers, node) { |
2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import
martin.trojer@nokia.com
parents:
diff
changeset
|
134 |
/* If there aren't pending AIO operations, don't invoke callbacks. |
2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import
martin.trojer@nokia.com
parents:
diff
changeset
|
135 |
* Otherwise, if there are no AIO requests, qemu_aio_wait() would |
2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import
martin.trojer@nokia.com
parents:
diff
changeset
|
136 |
* wait indefinitely. |
2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import
martin.trojer@nokia.com
parents:
diff
changeset
|
137 |
*/ |
2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import
martin.trojer@nokia.com
parents:
diff
changeset
|
138 |
if (node->io_flush && node->io_flush(node->opaque) == 0) |
2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import
martin.trojer@nokia.com
parents:
diff
changeset
|
139 |
continue; |
2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import
martin.trojer@nokia.com
parents:
diff
changeset
|
140 |
|
2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import
martin.trojer@nokia.com
parents:
diff
changeset
|
141 |
if (!node->deleted && node->io_read) { |
2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import
martin.trojer@nokia.com
parents:
diff
changeset
|
142 |
FD_SET(node->fd, &rdfds); |
2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import
martin.trojer@nokia.com
parents:
diff
changeset
|
143 |
max_fd = MAX(max_fd, node->fd + 1); |
2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import
martin.trojer@nokia.com
parents:
diff
changeset
|
144 |
} |
2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import
martin.trojer@nokia.com
parents:
diff
changeset
|
145 |
if (!node->deleted && node->io_write) { |
2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import
martin.trojer@nokia.com
parents:
diff
changeset
|
146 |
FD_SET(node->fd, &wrfds); |
2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import
martin.trojer@nokia.com
parents:
diff
changeset
|
147 |
max_fd = MAX(max_fd, node->fd + 1); |
2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import
martin.trojer@nokia.com
parents:
diff
changeset
|
148 |
} |
2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import
martin.trojer@nokia.com
parents:
diff
changeset
|
149 |
} |
2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import
martin.trojer@nokia.com
parents:
diff
changeset
|
150 |
|
2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import
martin.trojer@nokia.com
parents:
diff
changeset
|
151 |
walking_handlers = 0; |
2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import
martin.trojer@nokia.com
parents:
diff
changeset
|
152 |
|
2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import
martin.trojer@nokia.com
parents:
diff
changeset
|
153 |
/* No AIO operations? Get us out of here */ |
2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import
martin.trojer@nokia.com
parents:
diff
changeset
|
154 |
if (max_fd == -1) |
2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import
martin.trojer@nokia.com
parents:
diff
changeset
|
155 |
break; |
2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import
martin.trojer@nokia.com
parents:
diff
changeset
|
156 |
|
2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import
martin.trojer@nokia.com
parents:
diff
changeset
|
157 |
/* wait until next event */ |
2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import
martin.trojer@nokia.com
parents:
diff
changeset
|
158 |
ret = select(max_fd, &rdfds, &wrfds, NULL, NULL); |
2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import
martin.trojer@nokia.com
parents:
diff
changeset
|
159 |
if (ret == -1 && errno == EINTR) |
2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import
martin.trojer@nokia.com
parents:
diff
changeset
|
160 |
continue; |
2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import
martin.trojer@nokia.com
parents:
diff
changeset
|
161 |
|
2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import
martin.trojer@nokia.com
parents:
diff
changeset
|
162 |
/* if we have any readable fds, dispatch event */ |
2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import
martin.trojer@nokia.com
parents:
diff
changeset
|
163 |
if (ret > 0) { |
2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import
martin.trojer@nokia.com
parents:
diff
changeset
|
164 |
walking_handlers = 1; |
2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import
martin.trojer@nokia.com
parents:
diff
changeset
|
165 |
|
2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import
martin.trojer@nokia.com
parents:
diff
changeset
|
166 |
/* we have to walk very carefully in case |
2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import
martin.trojer@nokia.com
parents:
diff
changeset
|
167 |
* qemu_aio_set_fd_handler is called while we're walking */ |
2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import
martin.trojer@nokia.com
parents:
diff
changeset
|
168 |
node = LIST_FIRST(&aio_handlers); |
2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import
martin.trojer@nokia.com
parents:
diff
changeset
|
169 |
while (node) { |
2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import
martin.trojer@nokia.com
parents:
diff
changeset
|
170 |
AioHandler *tmp; |
2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import
martin.trojer@nokia.com
parents:
diff
changeset
|
171 |
|
2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import
martin.trojer@nokia.com
parents:
diff
changeset
|
172 |
if (!node->deleted && |
2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import
martin.trojer@nokia.com
parents:
diff
changeset
|
173 |
FD_ISSET(node->fd, &rdfds) && |
2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import
martin.trojer@nokia.com
parents:
diff
changeset
|
174 |
node->io_read) { |
2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import
martin.trojer@nokia.com
parents:
diff
changeset
|
175 |
node->io_read(node->opaque); |
2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import
martin.trojer@nokia.com
parents:
diff
changeset
|
176 |
} |
2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import
martin.trojer@nokia.com
parents:
diff
changeset
|
177 |
if (!node->deleted && |
2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import
martin.trojer@nokia.com
parents:
diff
changeset
|
178 |
FD_ISSET(node->fd, &wrfds) && |
2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import
martin.trojer@nokia.com
parents:
diff
changeset
|
179 |
node->io_write) { |
2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import
martin.trojer@nokia.com
parents:
diff
changeset
|
180 |
node->io_write(node->opaque); |
2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import
martin.trojer@nokia.com
parents:
diff
changeset
|
181 |
} |
2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import
martin.trojer@nokia.com
parents:
diff
changeset
|
182 |
|
2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import
martin.trojer@nokia.com
parents:
diff
changeset
|
183 |
tmp = node; |
2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import
martin.trojer@nokia.com
parents:
diff
changeset
|
184 |
node = LIST_NEXT(node, node); |
2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import
martin.trojer@nokia.com
parents:
diff
changeset
|
185 |
|
2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import
martin.trojer@nokia.com
parents:
diff
changeset
|
186 |
if (tmp->deleted) { |
2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import
martin.trojer@nokia.com
parents:
diff
changeset
|
187 |
LIST_REMOVE(tmp, node); |
2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import
martin.trojer@nokia.com
parents:
diff
changeset
|
188 |
qemu_free(tmp); |
2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import
martin.trojer@nokia.com
parents:
diff
changeset
|
189 |
} |
2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import
martin.trojer@nokia.com
parents:
diff
changeset
|
190 |
} |
2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import
martin.trojer@nokia.com
parents:
diff
changeset
|
191 |
|
2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import
martin.trojer@nokia.com
parents:
diff
changeset
|
192 |
walking_handlers = 0; |
2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import
martin.trojer@nokia.com
parents:
diff
changeset
|
193 |
} |
2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import
martin.trojer@nokia.com
parents:
diff
changeset
|
194 |
} while (ret == 0); |
2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import
martin.trojer@nokia.com
parents:
diff
changeset
|
195 |
} |