diff options
Diffstat (limited to 'Notes')
| -rw-r--r-- | Notes | 44 |
1 files changed, 9 insertions, 35 deletions
@@ -95,49 +95,15 @@ inode->count counts in-memory pointers to the struct blocks and inodes have ad-hoc sleep-locks provide a single mechanism? -test 14-character file names -and file arguments longer than 14 - kalloc() can return 0; do callers handle this right? -OH! recursive interrupts will use up any amount of cpu[].stack! - underflow and wrecks *previous* cpu's struct - -disk scheduling -mkdir -sh arguments -sh redirection -indirect blocks -is there a create/create race for same file name? - resulting in two entries w/ same name in directory? -why does shell often ignore first line of input? - test: one process unlinks a file while another links to it test: one process opens a file while another deletes it -test: mkdir. deadlock d/.. vs ../d, two processes. +test: deadlock d/.. vs ../d, two processes. test: dup() shared fd->off test: sbrk test: does echo foo > x truncate x? -make proc[0] runnable -cpu early tss and gdt -how do we get cpu0 scheduler() to use mpstack, not proc[0].kstack? -when iget() first sleeps, where does it longjmp to? -maybe set up proc[0] to be runnable, with entry proc0main(), then - have main() call scheduler()? - perhaps so proc[0] uses right kstack? - and scheduler() uses mpstack? -ltr sets the busy bit in the TSS, faults if already set - so gdt and TSS per cpu? - we don't want to be using some random process's gdt when it changes it. -maybe get rid of per-proc gdt and ts - one per cpu - refresh it when needed - setupsegs(proc *) - -why do we get 0 characters from keyboard? -are the locks in the right place in keyboardintr? - sh: support pipes? leave it for the class? sh: dynamic memory allocation? sh: should sh support ; () & --- need malloc @@ -146,3 +112,11 @@ sh: stop stdin on ctrl-d (for cat > y) really should have bdwrite() for file content and make some inode updates async so soft updates make sense + +disk scheduling +echo foo > bar should truncate bar + so O_CREATE should not truncate + but O_TRUNC should + +make it work on one cpu +make it work on amsterdam |