syscalls: avoid blocking accept() when not necessary

src/include/kernel/syscalls.h

@@ -15,6 +15,7 @@
 
 /* IPC syscall indexes, this range will be used for immediate handling without
  * waiting for the kernel thread to dispatch the syscall */
+#define SYSCALL_ACCEPT          44      // accept()
 #define SYSCALL_IPC_START       42      // bind()
 #define SYSCALL_IPC_END         46      // send()
 

src/syscalls/queue.c

@@ -28,7 +28,8 @@ void syscallHandle(void *ctx) {
         // allow immediate handling of IPC syscalls without going through the
         // syscall queue for performance
         if((req->function >= SYSCALL_IPC_START && req->function <= SYSCALL_IPC_END) ||
-            (req->function >= SYSCALL_RW_START && req->function <= SYSCALL_RW_END)) {
+            (req->function >= SYSCALL_RW_START && req->function <= SYSCALL_RW_END) ||
+            (req->function == SYSCALL_ACCEPT)) {
             setLocalSched(false);
             syscallDispatchTable[req->function](req);