author | erikj |
Tue, 12 Sep 2017 19:03:39 +0200 | |
changeset 47216 | 71c04702a3d5 |
parent 37789 | jdk/src/java.base/linux/native/libnio/ch/EPollArrayWrapper.c@d18410086785 |
permissions | -rw-r--r-- |
2 | 1 |
/* |
37789
d18410086785
8153192: (se) Selector.select(long) uses wrong timeout after EINTR (lnx)
bpb
parents:
25859
diff
changeset
|
2 |
* Copyright (c) 2005, 2016, Oracle and/or its affiliates. All rights reserved. |
2 | 3 |
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
4 |
* |
|
5 |
* This code is free software; you can redistribute it and/or modify it |
|
6 |
* under the terms of the GNU General Public License version 2 only, as |
|
5506 | 7 |
* published by the Free Software Foundation. Oracle designates this |
2 | 8 |
* particular file as subject to the "Classpath" exception as provided |
5506 | 9 |
* by Oracle in the LICENSE file that accompanied this code. |
2 | 10 |
* |
11 |
* This code is distributed in the hope that it will be useful, but WITHOUT |
|
12 |
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
|
13 |
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
|
14 |
* version 2 for more details (a copy is included in the LICENSE file that |
|
15 |
* accompanied this code). |
|
16 |
* |
|
17 |
* You should have received a copy of the GNU General Public License version |
|
18 |
* 2 along with this work; if not, write to the Free Software Foundation, |
|
19 |
* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
|
20 |
* |
|
5506 | 21 |
* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
22 |
* or visit www.oracle.com if you need additional information or have any |
|
23 |
* questions. |
|
2 | 24 |
*/ |
25 |
||
26 |
#include "jni.h" |
|
27 |
#include "jni_util.h" |
|
28 |
#include "jvm.h" |
|
29 |
#include "jlong.h" |
|
30 |
||
31 |
#include "sun_nio_ch_EPollArrayWrapper.h" |
|
32 |
||
33 |
#include <unistd.h> |
|
34 |
#include <sys/time.h> |
|
12672 | 35 |
#include <sys/epoll.h> |
2 | 36 |
|
37 |
#define RESTARTABLE(_cmd, _result) do { \ |
|
38 |
do { \ |
|
39 |
_result = _cmd; \ |
|
40 |
} while((_result == -1) && (errno == EINTR)); \ |
|
41 |
} while(0) |
|
42 |
||
43 |
||
44 |
static int |
|
45 |
iepoll(int epfd, struct epoll_event *events, int numfds, jlong timeout) |
|
46 |
{ |
|
47 |
jlong start, now; |
|
48 |
int remaining = timeout; |
|
49 |
struct timeval t; |
|
50 |
int diff; |
|
51 |
||
52 |
gettimeofday(&t, NULL); |
|
53 |
start = t.tv_sec * 1000 + t.tv_usec / 1000; |
|
54 |
||
55 |
for (;;) { |
|
37789
d18410086785
8153192: (se) Selector.select(long) uses wrong timeout after EINTR (lnx)
bpb
parents:
25859
diff
changeset
|
56 |
int res = epoll_wait(epfd, events, numfds, remaining); |
2 | 57 |
if (res < 0 && errno == EINTR) { |
58 |
if (remaining >= 0) { |
|
59 |
gettimeofday(&t, NULL); |
|
60 |
now = t.tv_sec * 1000 + t.tv_usec / 1000; |
|
61 |
diff = now - start; |
|
62 |
remaining -= diff; |
|
63 |
if (diff < 0 || remaining <= 0) { |
|
64 |
return 0; |
|
65 |
} |
|
66 |
start = now; |
|
67 |
} |
|
68 |
} else { |
|
69 |
return res; |
|
70 |
} |
|
71 |
} |
|
72 |
} |
|
73 |
||
74 |
JNIEXPORT void JNICALL |
|
75 |
Java_sun_nio_ch_EPollArrayWrapper_init(JNIEnv *env, jclass this) |
|
76 |
{ |
|
77 |
} |
|
78 |
||
79 |
JNIEXPORT jint JNICALL |
|
80 |
Java_sun_nio_ch_EPollArrayWrapper_epollCreate(JNIEnv *env, jobject this) |
|
81 |
{ |
|
82 |
/* |
|
83 |
* epoll_create expects a size as a hint to the kernel about how to |
|
84 |
* dimension internal structures. We can't predict the size in advance. |
|
85 |
*/ |
|
12672 | 86 |
int epfd = epoll_create(256); |
2 | 87 |
if (epfd < 0) { |
88 |
JNU_ThrowIOExceptionWithLastError(env, "epoll_create failed"); |
|
89 |
} |
|
90 |
return epfd; |
|
91 |
} |
|
92 |
||
93 |
JNIEXPORT jint JNICALL |
|
1142
e01e390f6551
6728542: (se) epoll based SelectorProvider should be portable to platforms other than x86 and x64
alanb
parents:
2
diff
changeset
|
94 |
Java_sun_nio_ch_EPollArrayWrapper_sizeofEPollEvent(JNIEnv* env, jclass this) |
e01e390f6551
6728542: (se) epoll based SelectorProvider should be portable to platforms other than x86 and x64
alanb
parents:
2
diff
changeset
|
95 |
{ |
e01e390f6551
6728542: (se) epoll based SelectorProvider should be portable to platforms other than x86 and x64
alanb
parents:
2
diff
changeset
|
96 |
return sizeof(struct epoll_event); |
e01e390f6551
6728542: (se) epoll based SelectorProvider should be portable to platforms other than x86 and x64
alanb
parents:
2
diff
changeset
|
97 |
} |
e01e390f6551
6728542: (se) epoll based SelectorProvider should be portable to platforms other than x86 and x64
alanb
parents:
2
diff
changeset
|
98 |
|
e01e390f6551
6728542: (se) epoll based SelectorProvider should be portable to platforms other than x86 and x64
alanb
parents:
2
diff
changeset
|
99 |
JNIEXPORT jint JNICALL |
e01e390f6551
6728542: (se) epoll based SelectorProvider should be portable to platforms other than x86 and x64
alanb
parents:
2
diff
changeset
|
100 |
Java_sun_nio_ch_EPollArrayWrapper_offsetofData(JNIEnv* env, jclass this) |
e01e390f6551
6728542: (se) epoll based SelectorProvider should be portable to platforms other than x86 and x64
alanb
parents:
2
diff
changeset
|
101 |
{ |
e01e390f6551
6728542: (se) epoll based SelectorProvider should be portable to platforms other than x86 and x64
alanb
parents:
2
diff
changeset
|
102 |
return offsetof(struct epoll_event, data); |
e01e390f6551
6728542: (se) epoll based SelectorProvider should be portable to platforms other than x86 and x64
alanb
parents:
2
diff
changeset
|
103 |
} |
e01e390f6551
6728542: (se) epoll based SelectorProvider should be portable to platforms other than x86 and x64
alanb
parents:
2
diff
changeset
|
104 |
|
2 | 105 |
JNIEXPORT void JNICALL |
106 |
Java_sun_nio_ch_EPollArrayWrapper_epollCtl(JNIEnv *env, jobject this, jint epfd, |
|
107 |
jint opcode, jint fd, jint events) |
|
108 |
{ |
|
109 |
struct epoll_event event; |
|
110 |
int res; |
|
111 |
||
112 |
event.events = events; |
|
113 |
event.data.fd = fd; |
|
114 |
||
12672 | 115 |
RESTARTABLE(epoll_ctl(epfd, (int)opcode, (int)fd, &event), res); |
2 | 116 |
|
117 |
/* |
|
118 |
* A channel may be registered with several Selectors. When each Selector |
|
119 |
* is polled a EPOLL_CTL_DEL op will be inserted into its pending update |
|
120 |
* list to remove the file descriptor from epoll. The "last" Selector will |
|
121 |
* close the file descriptor which automatically unregisters it from each |
|
122 |
* epoll descriptor. To avoid costly synchronization between Selectors we |
|
123 |
* allow pending updates to be processed, ignoring errors. The errors are |
|
124 |
* harmless as the last update for the file descriptor is guaranteed to |
|
125 |
* be EPOLL_CTL_DEL. |
|
126 |
*/ |
|
127 |
if (res < 0 && errno != EBADF && errno != ENOENT && errno != EPERM) { |
|
128 |
JNU_ThrowIOExceptionWithLastError(env, "epoll_ctl failed"); |
|
129 |
} |
|
130 |
} |
|
131 |
||
132 |
JNIEXPORT jint JNICALL |
|
133 |
Java_sun_nio_ch_EPollArrayWrapper_epollWait(JNIEnv *env, jobject this, |
|
134 |
jlong address, jint numfds, |
|
135 |
jlong timeout, jint epfd) |
|
136 |
{ |
|
137 |
struct epoll_event *events = jlong_to_ptr(address); |
|
138 |
int res; |
|
139 |
||
140 |
if (timeout <= 0) { /* Indefinite or no wait */ |
|
12672 | 141 |
RESTARTABLE(epoll_wait(epfd, events, numfds, timeout), res); |
2 | 142 |
} else { /* Bounded wait; bounded restarts */ |
143 |
res = iepoll(epfd, events, numfds, timeout); |
|
144 |
} |
|
145 |
||
146 |
if (res < 0) { |
|
147 |
JNU_ThrowIOExceptionWithLastError(env, "epoll_wait failed"); |
|
148 |
} |
|
149 |
return res; |
|
150 |
} |
|
151 |
||
152 |
JNIEXPORT void JNICALL |
|
153 |
Java_sun_nio_ch_EPollArrayWrapper_interrupt(JNIEnv *env, jobject this, jint fd) |
|
154 |
{ |
|
155 |
int fakebuf[1]; |
|
156 |
fakebuf[0] = 1; |
|
157 |
if (write(fd, fakebuf, 1) < 0) { |
|
158 |
JNU_ThrowIOExceptionWithLastError(env,"write to interrupt fd failed"); |
|
159 |
} |
|
160 |
} |