Non-SFI mode: Add Linux asynchronous signal support

src/untrusted/pthread/pthread_types.h

 /*
  * Copyright (c) 2012 The Native Client Authors. All rights reserved.
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 /*
  * Native Client pthreads implementation layer
  */
 
@@ skipping 55 matching lines @@
   void *irt_thread_data;
   struct __nc_basic_thread_data *basic_data;
 } nc_thread_descriptor_t;
 
 typedef struct __nc_basic_thread_data {
   void *retval;
   nc_thread_status_t status;
   pthread_cond_t join_condvar;
   /* Pointer to the tdb, will be null after the thread terminates. */
   nc_thread_descriptor_t *tdb;
+  pid_t native_tid;
 } nc_basic_thread_data_t;
 
 /*
  * This structure is allocated for all threads.  However, for threads
  * created with pthread_create(), the basic_data field is not used,
  * and a separate nc_basic_thread_data_t struct is allocated.  The
  * initial thread, and threads created by the IRT's thread_create()
  * interface, do use the basic_data field though.
  * TODO(mseaborn): Clean this up to be more consistent.
  */
 struct nc_combined_tdb {
   nc_thread_descriptor_t tdb;
   nc_basic_thread_data_t basic_data;
 };
 
 
 #define MEMORY_BLOCK_ALLOCATION_SIZE(real_size) \
   (sizeof(nc_thread_memory_block_t) + (real_size))
 
 static inline void *nc_memory_block_to_payload(nc_thread_memory_block_t *node) {
   return &node[1];
 }
 
 #ifdef __cplusplus
 }
 #endif
 
 #endif  /* NATIVE_CLIENT_SRC_UNTRUSTED_PTHREAD_NC_PTHREAD_TYPES_H_ */