From: Kable Dan (CDI)
Sent: Monday, June 20, 2011 10:34 AM
To: '[email protected]'
Subject: Multiple Easy Interface FTP Threads not calling write function
callback when more than 2 active
I686 Linux system
Tested versions: libcurl/7.21.6 and libcurl/7.21.2
I am creating up to 4 concurrent threads of Easy Interface calls each of which
are setup within their own thread as:
myTracker->curl = curl_easy_init();
if(myTracker->curl)
{
curl_easy_setopt(myTracker->curl, CURLOPT_URL,(void
*)myTracker->inUri.c_str());
curl_easy_setopt(myTracker->curl, CURLOPT_RESUME_FROM_LARGE,
(curl_off_t)myTracker->currentSize);
curl_easy_setopt(myTracker->curl, CURLOPT_WRITEFUNCTION,
&writeMemoryCallback);
curl_easy_setopt(myTracker->curl, CURLOPT_WRITEDATA, (void *)myTracker);
curl_easy_setopt(myTracker->curl, CURLOPT_USERAGENT,
"libcurl-agent/1.0");
curl_easy_setopt(myTracker->curl, CURLOPT_NOBODY,0L);
curl_easy_setopt(myTracker->curl, CURLOPT_HEADER,0L);
curl_easy_setopt(myTracker->curl, CURLOPT_FOLLOWLOCATION,1L);
curl_easy_setopt(myTracker->curl, CURLOPT_CONNECTTIMEOUT, 10L);
if( myTracker->currentBandwidth )
{
curl_easy_setopt(myTracker->curl, CURLOPT_MAX_RECV_SPEED_LARGE,
myTracker->currentBandwidth);
curl_easy_setopt(myTracker->curl, CURLOPT_MAX_SEND_SPEED_LARGE,
myTracker->currentBandwidth);
}
curl_easy_setopt(myTracker->curl, CURLOPT_ERRORBUFFER, curlErrorInfo);
curl_easy_setopt(myTracker->curl, CURLOPT_NOPROGRESS, 1L);
myTracker->copyStartTime = time(NULL);
myTracker->lastCopyTime = myTracker->copyStartTime;
res = curl_easy_perform(myTracker->curl);
}
The thread that creates up to 4 of the above Easy Interface threads has the
curl_global_init(CURL_GLOBAL_ALL);
before any of the Easy Interface Threads are called.
I am only downloading, using protocols FTP, HTTP, TFTP, and FILE. I am using
IIS under windows 7 as the test HTTP and FTP server. All concurrent requests
go to this server for different files. When I use http as the protocol, my
callback function, writeMemoryCallback is being called for every thread up to
the max 4 all the time. When I use ftp as the protocol, only the first two
threads use the writeMemoryCallback function during the transfer. The other
two ftp threads are downloading the file but never call the callback function
until the file has been totally transferred. This makes it impossible to
report status on any ftp download > 2.
Dan Kable
[email protected]
work: (317) 587 4162
101 W. 103rd St.
Indianapolis, IN 46290
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