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Protect the process list using mutex.

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This commit is contained in:
Stephen Marz 2020-05-17 15:20:30 -04:00
parent 43e18b498d
commit f5c94e377b
1 changed files with 3 additions and 1 deletions
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4
risc_v/src/syscall.rs
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@ -10,7 +10,7 @@ use crate::{block::block_op,
buffer::Buffer,
kmem::{kfree, kmalloc},
page::{virt_to_phys, Table},
process::{PROCESS_LIST, delete_process, get_by_pid, set_sleeping, set_waiting, add_kernel_process_args}};
process::{PROCESS_LIST, PROCESS_LIST_MUTEX, delete_process, get_by_pid, set_sleeping, set_waiting, add_kernel_process_args}};
use alloc::string::String;
use core::mem::size_of;
/// do_syscall is called from trap.rs to invoke a system call. No discernment is
@ -245,10 +245,12 @@ fn exec_func(args: usize) {
println!("Failed to launch process.");
}
else {
PROCESS_LIST_MUTEX.sleep_lock();
if let Some(mut proc_list) = PROCESS_LIST.take() {
proc_list.push_back(proc.ok().unwrap());
PROCESS_LIST.replace(proc_list);
}
PROCESS_LIST_MUTEX.unlock();
}
kfree(inode_ptr as *mut u8);
}