Supporting concurrent shared memory fd receive in router.

Two different router threads may send different requests to single
application worker.  In this case shared memory fds from worker
to router will be send over 2 different router ports.  These fds
will be received and processed by different threads in any order.

This patch made possible to add incoming shared memory segments in
arbitrary order.  Additionally, array and memory pool are no longer
used to store segments because of pool's single threaded nature.

Custom array-like structure nxt_port_mmaps_t introduced.

1 files changed, 13 insertions, 5 deletions

diff --git a/src/nxt_process.h b/src/nxt_process.h
index 26e7de18..ae0e1661 100644
--- a/src/nxt_process.h
+++ b/src/nxt_process.h
@@ -42,6 +42,17 @@ struct nxt_process_init_s {
 };
 
 
+typedef struct nxt_port_mmap_s  nxt_port_mmap_t;
+typedef struct nxt_port_mmaps_s nxt_port_mmaps_t;
+
+struct nxt_port_mmaps_s {
+    nxt_thread_mutex_t  mutex;
+    uint32_t            size;
+    uint32_t            cap;
+    nxt_port_mmap_t     *elts;
+};
+
+
 typedef struct {
     nxt_pid_t           pid;
     nxt_queue_t         ports;      /* of nxt_port_t */
@@ -51,11 +62,8 @@ typedef struct {
 
     nxt_process_init_t  *init;
 
-    nxt_thread_mutex_t  incoming_mutex;
-    nxt_array_t         *incoming;  /* of nxt_port_mmap_t */
-
-    nxt_thread_mutex_t  outgoing_mutex;
-    nxt_array_t         *outgoing;  /* of nxt_port_mmap_t */
+    nxt_port_mmaps_t    incoming;
+    nxt_port_mmaps_t    outgoing;
 
     nxt_thread_mutex_t  cp_mutex;
     nxt_lvlhsh_t        connected_ports; /* of nxt_port_t */