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each socket is used by exactly one easy handle, but of course each easy handle

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can and will use more than one socket
This commit is contained in:
Daniel Stenberg
2006-04-21 13:40:07 +00:00
parent 6e520c4cdc
commit 0ec96e4279
2 changed files with 41 additions and 91 deletions
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117
lib/multi.c
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@@ -83,7 +83,6 @@ typedef enum {
struct socketstate {
curl_socket_t socks[MAX_SOCKSPEREASYHANDLE];
long action; /* socket action bitmap */
long timeout[MAX_SOCKSPEREASYHANDLE];
};
struct Curl_one_easy {
@@ -173,19 +172,20 @@ static void multistate(struct Curl_one_easy *easy, CURLMstate state)
}
/*
* We add one of these structs to the sockhash, and then if we add more easy
* handles for the same socket we just link them with the next/prev pointers
* from the node added to the hash. We only remove the node from the hash when
* the final easy handle/socket associated with the node is removed.
* We add one of these structs to the sockhash for a particular socket
*/
struct Curl_sh_entry {
struct Curl_sh_entry *next;
struct Curl_sh_entry *prev;
struct SessionHandle *easy;
time_t timestamp;
long inuse;
int action; /* what action READ/WRITE this socket waits for */
void *userp; /* settable by users (not yet decided exactly how) */
};
/* bits for 'action' having no bits means this socket is not expecting any
action */
#define SH_READ 1
#define SG_WRITE 2
/* make sure this socket is present in the hash for this handle */
static int sh_addentry(struct curl_hash *sh,
@@ -196,16 +196,9 @@ static int sh_addentry(struct curl_hash *sh,
Curl_hash_pick(sh, (char *)&s, sizeof(curl_socket_t));
struct Curl_sh_entry *check;
if(there) {
/* verify that this particular handle is in here */
check = there;
while(check) {
if(check->easy == data)
/* it is, return fine */
return 0;
check = check->next;
}
}
if(there)
/* it is present, return fine */
return 0;
/* not present, add it */
check = calloc(sizeof(struct Curl_sh_entry), 1);
@@ -213,57 +206,25 @@ static int sh_addentry(struct curl_hash *sh,
return 1; /* major failure */
check->easy = data;
if(there) {
/* the node for this socket is already here, now link in the struct for
the new handle */
/* make/add new hash entry */
if(NULL == Curl_hash_add(sh, (char *)&s, sizeof(curl_socket_t), check))
return 1; /* major failure */
check->next = there->next; /* get the previous next to point to */
there->next = check; /* make the new next point to the new entry */
check->next->prev = check; /* make sure the next one points back to the
new one */
/* check->prev = NULL; is already cleared and we have no previous
node */
}
else {
/* make/add new hash entry */
if(NULL == Curl_hash_add(sh, (char *)&s, sizeof(curl_socket_t), check))
return 1; /* major failure */
}
return 0; /* things are good in sockhash land */
}
/* delete the given socket + handle from the hash */
static void sh_delentry(struct curl_hash *sh,
curl_socket_t s,
struct SessionHandle *data)
static void sh_delentry(struct curl_hash *sh, curl_socket_t s)
{
struct Curl_sh_entry *there =
Curl_hash_pick(sh, (char *)&s, sizeof(curl_socket_t));
while(there) {
/* this socket is in the hash, now scan the list at this point and see if
the given easy handle is in there and if so remote that singe entry */
if(there->easy == data) {
/* match! */
if(there->next || there->prev) {
/* it is not the only handle for this socket, so only unlink this
particular easy handle and leave the actional hash entry */
/* unlink */
there->next->prev = there->prev;
there->prev->next = there->next;
free(there);
}
else {
/* This is the only easy handle for this socket, we must remove the
hash entry. (This'll end up in a call to sh_freeentry().) */
Curl_hash_delete(sh, (char *)&s, sizeof(curl_socket_t));
}
break;
}
there = there->next;
if(there) {
/* this socket is in the hash */
/* We remove the hash entry. (This'll end up in a call to
sh_freeentry().) */
Curl_hash_delete(sh, (char *)&s, sizeof(curl_socket_t));
}
}
@@ -273,14 +234,6 @@ static void sh_delentry(struct curl_hash *sh,
static void sh_freeentry(void *freethis)
{
struct Curl_sh_entry *p = (struct Curl_sh_entry *) freethis;
struct Curl_sh_entry *more = p->next;
/* if there's a chain of more handles, remove that chain first */
while(more) {
struct Curl_sh_entry *next = more->next;
free(more);
more = next;
}
free(p);
}
@@ -1034,8 +987,9 @@ CURLMsg *curl_multi_info_read(CURLM *multi_handle, int *msgs_in_queue)
}
/*
* Check what sockets we deal with and their "action state" and if we have a
* difference from last time we call the callback accordingly.
* singlesocket() checks what sockets we deal with and their "action state"
* and if we have a different state in any of those sockets from last time we
* call the callback accordingly.
*/
static void singlesocket(struct Curl_multi *multi,
struct Curl_one_easy *easy)
@@ -1050,9 +1004,11 @@ static void singlesocket(struct Curl_multi *multi,
/* first fill in the 'current' struct with the state as it is now */
current.action = multi_getsock(easy, current.socks, MAX_SOCKSPEREASYHANDLE);
/* when filled in, we compare with the previous round's state */
/* when filled in, we compare with the previous round's state in a first
quick memory compare check */
if(memcmp(&current, &easy->sockstate, sizeof(struct socketstate))) {
/* difference, call the callback once for every socket change ! */
/* there is difference, call the callback once for every socket change ! */
for(i=0; i< MAX_SOCKSPEREASYHANDLE; i++) {
int action;
curl_socket_t s = current.socks[i];
@@ -1103,7 +1059,7 @@ static void singlesocket(struct Curl_multi *multi,
/* Update the sockhash accordingly */
if(action == CURL_POLL_REMOVE)
/* remove from hash for this easy handle */
sh_delentry(multi->sockhash, s, easy->easy_handle);
sh_delentry(multi->sockhash, s);
else
/* make sure this socket is present in the hash for this handle */
sh_addentry(multi->sockhash, s, easy->easy_handle);
@@ -1138,6 +1094,7 @@ static CURLMcode multi_socket(struct Curl_multi *multi,
easyp = easyp->next;
}
/* or should we fall-through and do the timer-based stuff? */
return result;
}
else if (s != CURL_SOCKET_TIMEOUT) {
@@ -1152,20 +1109,16 @@ static CURLMcode multi_socket(struct Curl_multi *multi,
/* Now, there is potentially a chain of easy handles in this hash
entry struct and we need to deal with all of them */
do {
data = entry->easy;
data = entry->easy;
result = multi_runsingle(multi, data->set.one_easy, &running_handles);
result = multi_runsingle(multi, data->set.one_easy, &running_handles);
if(result == CURLM_OK)
/* get the socket(s) and check if the state has been changed since
last */
singlesocket(multi, data->set.one_easy);
entry = entry->next;
} while(entry);
if(result == CURLM_OK)
/* get the socket(s) and check if the state has been changed since
last */
singlesocket(multi, data->set.one_easy);
/* or should we fall-through and do the timer-based stuff? */
return result;
}