change synchronization with agent

src/agent.rs

@@ -5,7 +5,7 @@ use libc::{
     MFD_ALLOW_SEALING, PROT_READ, PROT_WRITE,
 };
 use shared_memory_heap::get_shared_mem_fd;
-use std::{ffi::CString, path::Path, ptr, usize};
+use std::{arch::x86_64::_mm_mfence, ffi::CString, path::Path, ptr, usize};
 
 pub struct Agent {
     sync_mem: *mut usize,
@@ -66,7 +66,7 @@ impl Agent {
 
             execve(path.as_ptr() as *const c_char, args.as_ptr(), ptr::null());
 
-            perror("execve:\x00".as_ptr() as *const c_char);
+            perror(r#"execve:\0"#.as_ptr() as *const c_char);
 
             panic!("execve failed");
         }
@@ -83,29 +83,12 @@ impl Agent {
             *self.sync_mem.add(i + 2) = *ptr;
         }
 
-        // wake agent
-        let mut woken_up = 0;
-        while woken_up == 0 {
-            woken_up = syscall(
-                SYS_futex,
-                self.sync_mem,
-                FUTEX_WAKE,
-                1,
-                ptr::null::<u8>(),
-                ptr::null::<u8>(),
-                0,
-            );
-        }
+        *self.sync_mem = 1;
 
-        // wait for agent to be finished
-        syscall(
-            SYS_futex,
-            self.sync_mem,
-            FUTEX_WAIT,
-            0,
-            ptr::null::<u8>(),
-            ptr::null::<u8>(),
-            0,
-        );
+        _mm_mfence();
+        #[allow(clippy::while_immutable_condition)]
+        while *self.sync_mem == 1 {
+            _mm_mfence();
+        }
     }
 }