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Enter meltdown mode if ProgramMaxWorkers triggers

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This commit is contained in:
Justine Tunney 2022-08-05 15:42:17 -07:00
parent 9c06067c84
commit c9d7838213
2 changed files with 11 additions and 5 deletions
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8
tool/net/help.txt
View file

@ -741,10 +741,10 @@ FUNCTIONS
Turns Lua data structure into JSON string.
Since Lua uses tables are both hashmaps and arrays, we use a
simple fast algorithm for telling the two apart. Tables with
non-zero length (as reported by `#`) are encoded as arrays,
and any non-array elements are ignored. For example:
Since Lua tables are both hashmaps and arrays, we use a simple
fast algorithm for telling the two apart. Tables with non-zero
length (as reported by `#`) are encoded as arrays, and any
non-array elements are ignored. For example:
>: EncodeJson({2})
"[2]"

8
tool/net/redbean.c
View file

@ -4755,6 +4755,7 @@ static int LuaProgramMaxWorkers(lua_State *L) {
}
lua_pushinteger(L, maxworkers);
if (lua_isinteger(L, 1)) maxworkers = lua_tointeger(L, 1);
maxworkers = MAX(maxworkers, 1);
return 1;
}
@ -6749,6 +6750,12 @@ static int HandleConnection(size_t i) {
if ((client = accept4(servers.p[i].fd, &clientaddr, &clientaddrsize,
SOCK_CLOEXEC)) != -1) {
startconnection = nowl();
if (UNLIKELY(maxworkers) && shared->workers >= maxworkers) {
EnterMeltdownMode();
SendServiceUnavailable();
close(client);
return 0;
}
VERBOSEF("(srvr) accept %s via %s", DescribeClient(), DescribeServer());
messageshandled = 0;
if (hasonclientconnection && LuaOnClientConnection()) {
@ -6939,7 +6946,6 @@ static int HandlePoll(int ms) {
if (!polls[pollid].revents) continue;
if (polls[pollid].fd < 0) continue;
if (polls[pollid].fd) {
if (maxworkers && shared->workers >= maxworkers) continue;
// handle listen socket
lua_repl_lock();
serverid = pollid - 1;