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Finish part C.

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This commit is contained in:
Danila Fedorin
2019-05-05 22:08:12 -07:00
parent 721a113c93
commit 9acc7c80f7
6 changed files with 88 additions and 9 deletions
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19
lib/ipc.c
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@@ -22,9 +22,14 @@
int32_t
ipc_recv(envid_t *from_env_store, void *pg, int *perm_store)
{
// LAB 4: Your code here.
panic("ipc_recv not implemented");
return 0;
int return_code;
if((return_code = sys_ipc_recv(pg ? pg : (void*) ~0)) < 0)
return return_code;
if(from_env_store) *from_env_store = thisenv->env_ipc_from;
if(perm_store) *perm_store = thisenv->env_ipc_perm;
return thisenv->env_ipc_value;
}
// Send 'val' (and 'pg' with 'perm', if 'pg' is nonnull) to 'toenv'.
@@ -38,8 +43,12 @@ ipc_recv(envid_t *from_env_store, void *pg, int *perm_store)
void
ipc_send(envid_t to_env, uint32_t val, void *pg, int perm)
{
// LAB 4: Your code here.
panic("ipc_send not implemented");
int return_code = -E_IPC_NOT_RECV;
while(return_code == -E_IPC_NOT_RECV) {
return_code = sys_ipc_try_send(to_env, val, pg ? pg : (void*) ~0, perm);
sys_yield();
}
if(return_code != 0) panic("failed to send\n");
}
// Find the first environment of the given type. We'll use this to