diff options
Diffstat (limited to 'src/threads/thread.h')
| -rw-r--r-- | src/threads/thread.h | 26 |
1 files changed, 26 insertions, 0 deletions
diff --git a/src/threads/thread.h b/src/threads/thread.h index 0039560..a3bc814 100644 --- a/src/threads/thread.h +++ b/src/threads/thread.h @@ -4,6 +4,9 @@ #include <debug.h> #include <list.h> #include <stdint.h> +#include "threads/synch.h" + +#define MAX_FDS 128 /* Max number of file descriptors per thread */ /* States in a thread's life cycle. */ enum thread_status @@ -19,6 +22,23 @@ enum thread_status typedef int tid_t; #define TID_ERROR ((tid_t) -1) /* Error value for tid_t. */ +/* The relationship between a parent and child process. + The child reports its exit status by setting exit_status. + The parent places the parent_child element in its list of children. +*/ +struct parent_child + { + struct list_elem elem; // owned by the parent + + // exit_status is readable by the parent + struct semaphore exit_sema; + int exit_status; + + struct lock l; + int alive_count; + tid_t child_tid; + }; + /* Thread priorities. */ #define PRI_MIN 0 /* Lowest priority. */ #define PRI_DEFAULT 31 /* Default priority. */ @@ -80,6 +100,7 @@ typedef int tid_t; only because they are mutually exclusive: only a thread in the ready state is on the run queue, whereas only a thread in the blocked state is on a semaphore wait list. */ + struct thread { /* Owned by thread.c. */ @@ -95,6 +116,11 @@ struct thread #ifdef USERPROG /* Owned by userprog/process.c. */ uint32_t *pagedir; /* Page directory. */ + struct file **fds; /* Pointer to array of file descriptors. */ + bool load_success; + + struct parent_child *parent; // one parent + struct list children; // multiple children #endif /* Owned by thread.c. */ |