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Better syncio.c with millisecond resolution.

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This commit is contained in:
antirez 2012-03-31 11:21:45 +02:00
parent c2672a06cd
commit 04d360fdcd
2 changed files with 48 additions and 19 deletions
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6
src/redis.h
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@ -945,9 +945,9 @@ int equalStringObjects(robj *a, robj *b);
unsigned long estimateObjectIdleTime(robj *o);
/* Synchronous I/O with timeout */
int syncWrite(int fd, char *ptr, ssize_t size, int timeout);
int syncRead(int fd, char *ptr, ssize_t size, int timeout);
int syncReadLine(int fd, char *ptr, ssize_t size, int timeout);
ssize_t syncWrite(int fd, char *ptr, ssize_t size, long long timeout);
ssize_t syncRead(int fd, char *ptr, ssize_t size, long long timeout);
ssize_t syncReadLine(int fd, char *ptr, ssize_t size, long long timeout);
/* Replication */
void replicationFeedSlaves(list *slaves, int dictid, robj **argv, int argc);

61
src/syncio.c
View File

@ -36,50 +36,79 @@
* of the SYNC command where the slave does it in a blocking way, and
* the MIGRATE command that must be blocking in order to be atomic from the
* point of view of the two instances (one migrating the key and one receiving
* the key). This is why need the following blocking I/O functions. */
* the key). This is why need the following blocking I/O functions.
*
* All the functions take the timeout in milliseconds. */
int syncWrite(int fd, char *ptr, ssize_t size, int timeout) {
#define REDIS_SYNCIO_RESOLUTION 10 /* Resolution in milliseconds */
/* Write the specified payload to 'fd'. If writing the whole payload will be done
* within 'timeout' milliseconds the operation succeeds and 'size' is returned.
* Otherwise the operation fails, -1 is returned, and an unspecified partial write
* could be performed against the file descriptor. */
ssize_t syncWrite(int fd, char *ptr, ssize_t size, long long timeout) {
ssize_t nwritten, ret = size;
time_t start = time(NULL);
long long start = mstime();
long long remaining = timeout;
timeout++;
while(size) {
if (aeWait(fd,AE_WRITABLE,1000) & AE_WRITABLE) {
while(1) {
long long wait = (remaining > REDIS_SYNCIO_RESOLUTION) ?
remaining : REDIS_SYNCIO_RESOLUTION;
long long elapsed;
if (aeWait(fd,AE_WRITABLE,wait) & AE_WRITABLE) {
nwritten = write(fd,ptr,size);
if (nwritten == -1) return -1;
ptr += nwritten;
size -= nwritten;
if (size == 0) return ret;
}
if ((time(NULL)-start) > timeout) {
elapsed = mstime() - start;
if (elapsed >= timeout) {
errno = ETIMEDOUT;
return -1;
}
remaining = timeout - elapsed;
}
return ret;
}
int syncRead(int fd, char *ptr, ssize_t size, int timeout) {
/* Read the specified amount of bytes from 'fd'. If all the bytes are read within
* 'timeout' milliseconds the operation succeed and 'size' is returned.
* Otherwise the operation fails, -1 is returned, and an unspecified amount of
* data could be read from the file descriptor. */
ssize_t syncRead(int fd, char *ptr, ssize_t size, long long timeout) {
ssize_t nread, totread = 0;
time_t start = time(NULL);
long long start = mstime();
long long remaining = timeout;
timeout++;
while(size) {
if (aeWait(fd,AE_READABLE,1000) & AE_READABLE) {
while(1) {
long long wait = (remaining > REDIS_SYNCIO_RESOLUTION) ?
remaining : REDIS_SYNCIO_RESOLUTION;
long long elapsed;
if (aeWait(fd,AE_READABLE,wait) & AE_READABLE) {
nread = read(fd,ptr,size);
if (nread <= 0) return -1;
ptr += nread;
size -= nread;
totread += nread;
if (size == 0) return totread;
}
if ((time(NULL)-start) > timeout) {
elapsed = mstime() - start;
if (elapsed >= timeout) {
errno = ETIMEDOUT;
return -1;
}
remaining = timeout - elapsed;
}
return totread;
}
int syncReadLine(int fd, char *ptr, ssize_t size, int timeout) {
/* Read a line making sure that every char will not require more than 'timeout'
* milliseconds to be read.
*
* On success the number of bytes read is returned, otherwise -1.
* On success the string is always correctly terminated with a 0 byte. */
ssize_t syncReadLine(int fd, char *ptr, ssize_t size, long long timeout) {
ssize_t nread = 0;
size--;